Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Long-term Debt (Details Textual)

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Note 6 - Long-term Debt (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 31, 2011
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Term Loan [Member]        
Debt Instrument, Periodic Payment, Principal   $ 102,000   $ 102,000
Long-term Debt [1],[2],[3]   4,735,000   5,030,000
PNC Bank [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility, Remaining Borrowing Capacity   2,350,000    
Line of Credit Facility Reduction   1,250,000    
Revised Loan Agreement [Member] | PNC Bank [Member]        
Debt Instrument, Termination Notice 90 days      
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] | Term Loan [Member]        
Debt Instrument, Periodic Payment, Principal $ 101,600   $ 190,000  
Long-term Debt 6,100,000      
Term Loan [Member]        
Debt Issuance Costs, Net   142,000   $ 151,000
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, Term 7 years      
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member]        
Line of Credit Facility Reduction   2,000,000    
Line of Credit Facility Reduction, Additional Reduction   $ 750,000    
[1] Net of debt issuance costs of ($142,000) and ($151,000) at March 31, 2017 and December 31, 2016, 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] Prior to April 1, 2016, the monthly installment payment under the term loan was approximately $190,000.