Annual report pursuant to Section 13 and 15(d)

Note 10 - Long-term Debt (Details Textual)

v3.6.0.2
Note 10 - Long-term Debt (Details Textual)
 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 17, 2016
USD ($)
Aug. 02, 2016
USD ($)
shares
Mar. 24, 2016
USD ($)
Aug. 02, 2013
USD ($)
$ / shares
shares
Oct. 31, 2011
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 16, 2016
USD ($)
Aug. 22, 2016
USD ($)
Aug. 21, 2016
USD ($)
May 23, 2016
USD ($)
Jul. 28, 2014
USD ($)
Debt Instrument, Annual Spending Limit for Capital Spending     $ 3,000,000   $ 6,000,000                  
Payments of Debt Issuance Costs               $ 122,000 $ 40,000          
Lenders [Member]                            
Class of Warrant or Right, Exercised During Period | shares   35,000                        
Proceeds from Warrant Exercises   $ 156,000                        
Term Loan [Member]                            
Debt Instrument, Periodic Payment, Principal               102,000 102,000          
Long-term Debt [1],[2],[3]           $ 5,030,000   5,030,000 6,514,000          
Promissory Note Dated August 2, 2013 [Member]                            
Debt Instrument, Periodic Payment, Principal               125,000 125,000          
Long-term Debt [4],[5]             950,000          
Promissory Note Dated August 2, 2013 [Member] | Lenders [Member]                            
Proceeds from Issuance of Long-term Debt       $ 3,000,000                    
Number of Shares Issued to Each Lender on Warrant | shares       35,000                    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares       $ 2.23                    
Number of Shares Received by each Lender | shares       45,000                    
PNC Bank [Member] | Revolving Credit Facility [Member]                            
Line of Credit Facility Reduction           1,250,000   1,250,000            
Line of Credit Facility, Current Borrowing Capacity           1,748,000   1,748,000            
Revised Loan Agreement [Member] | PNC Bank [Member]                            
Payments of Debt Issuance Costs     $ 72,000                      
Debt Instrument, Termination Notice     90 days                      
Debt Instrument, Covenant, Fixed Charge Coverage Ratio             1.15              
Debt Instrument, Fee Amount                     $ 25,000      
Debt Instrument, Covenant Compliance, Minimum Tangible Adjusted Net Worth                     $ 26,000,000 $ 30,000,000    
Revised Loan Agreement [Member] | PNC Bank [Member] | On or Before March 23, 2017 [Member]                            
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations     1.00%                      
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2017 But Prior to or on March 23, 2018 [Member]                            
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations     0.50%                      
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2018 But Prior to or on March 23, 2019 [Member]                            
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations     0.25%                      
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2019 [Member]                            
Debt Instrument Percentage of Total Finacing to be Paid Upon Early Retirement of Debt Obligations     0.00%                      
Revised Loan Agreement [Member] | PNC Bank [Member] | Interest Expense [Member]                            
Gain (Loss) on Extinguishment of Debt               $ (68,000)            
Revised Loan Agreement [Member] | PNC Bank [Member] | Selling, General and Administrative Expenses [Member]                            
Debt Instrument, Fee Amount                         $ 5,000  
Revised Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity     $ 12,000,000                      
Release of Borrowing Reduction on Line of Credit     $ 1,000,000                      
Revised Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate     1.75%                      
Revised Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                            
Debt Instrument, Basis Spread on Variable Rate     2.75%                      
Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member]                            
Debt Instrument, Periodic Payment, Principal     $ 101,600       $ 190,000              
Long-term Debt     $ 6,100,000                      
Debt Instrument, Term     5 years                      
Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | Prime Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate     2.25%         3.75%            
Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                            
Debt Instrument, Basis Spread on Variable Rate     3.25%                      
Promissory Note Dated August 2, 2013 [Member]                            
Debt Instrument, Unamortized Discount           0   $ 0 50,000          
Term Loan [Member]                            
Debt Issuance Costs, Net           151,000   $ 151,000 $ 152,000          
Amended Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member]                            
Line of Credit Facility, Maximum Borrowing Capacity         $ 12,000,000                  
Amended Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate         2.00%                  
Amended Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                            
Debt Instrument, Basis Spread on Variable Rate         3.00%                  
Amended Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | Prime Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate         2.50%                  
Amended Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                            
Debt Instrument, Basis Spread on Variable Rate         3.50%                  
Amendment 4 [Member] | PNC Bank [Member] | Term Loan [Member]                            
Debt Instrument, Periodic Payment, Principal         $ 190,000                  
Long-term Debt         $ 16,000,000                  
Debt Instrument, Term         7 years                  
Amendment 6 [Member] | PNC Bank [Member] | Revolving Credit Facility [Member]                            
Line of Credit Facility Reduction                           $ 1,500,000
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member]                            
Line of Credit Facility Reduction $ 2,000,000                 $ 500,000        
Debt Instrument, Covenant, Fixed Charge Coverage Ratio               1.15            
Debt Instrument, Fee Amount 25,000                          
Line of Credit Facility Reduction, Additional Reduction $ 750,000         $ 750,000                
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate 2.00%                          
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                            
Debt Instrument, Basis Spread on Variable Rate 3.00%                          
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | Prime Rate [Member]                            
Debt Instrument, Basis Spread on Variable Rate 2.50%                          
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]                            
Debt Instrument, Basis Spread on Variable Rate 3.50%                          
[1] Net of debt issuance costs of ($151,000) and ($152,000) at December 31, 2016 and December 31, 2015, respectively.
[2] Our revolving credit facility is collateralized by our accounts receivable and our term loan is collateralized by our property, plant, and equipment.
[3] See below "Revolving Credit and Term Loan Agreement" for monthly payment interest options. Prior to April 1, 2016, the monthly installment payment under the term loan was approximately $190,000.
[4] Net of debt discount of ($50,000) at December 31, 2015. See "Promissory Notes" below for additional information.
[5] Uncollateralized note.