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Note 6 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   1 year      
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   10 years      
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period   6 years 73 days 3 years 182 days 4 years 73 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 38,000 21,000 35,090 38,000 49,000
Warrants [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 146 days        
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period   0 0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,000 0 0 2,000 4,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years      
Allocated Share-based Compensation Expense   $ 21,160 $ 58,960 $ 53,200  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate   7.10% 0.00% 0.00%  
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options   $ 7,688 $ 21,420    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   0      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   969,704      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   126,220      
Share-based Compensation Arrangement by Share Based Payment Award Options Grants in Period Fair Value   $ 21,160