Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Capital Stock, Stock Plans and Stock-based Compensation (Details Textual)

v3.7.0.1
Note 4 - Capital Stock, Stock Plans and Stock-based Compensation (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 13, 2017
May 15, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         6,000 50,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         $ 3.79 $ 3.79
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 64,000   $ 64,000  
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Remainder of Fiscal Year     18,000   18,000  
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Two     33,000   33,000  
Employee Service Share-based Compensation Nonvested Awards, Compensation Not yet Recognized, Stock Options, Year Three     13,000   13,000  
Allocated Share-based Compensation Expense     19,000 $ 17,000 41,000 $ 45,000
Employee Stock Option [Member]            
Allocated Share-based Compensation Expense     $ 11,000 $ 17,000 $ 21,000 $ 31,000
The 2003 Outside Directors Stock Plan [Member]            
Stock Issued During Period, Shares, Issued for Services         28,964  
The 2003 Outside Directors Stock Plan [Member] | Selling, General and Administrative Expenses [Member]            
Allocated Share-based Compensation Expense         $ 110,000  
The 2003 Outside Directors Stock Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1] 10 years          
The 2003 Outside Directors Stock Plan [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 6,000          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 3.79          
The 2003 Outside Directors Stock Plan [Member] | Director [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 180 days          
The 2010 Stock Option Plan [Member] | Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term [1]   6 years        
The 2010 Stock Option Plan [Member] | Incentive Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term   6 years        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years        
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 3.97        
The 2010 Stock Option Plan [Member] | Executive Vice President [Member] | Incentive Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures   50,000        
[1] The expected option life is based on historical exercises and post-vesting data.