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Note 2 - Equity Compensation Plans and Capital Stock (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Jan. 04, 2017
Mar. 31, 2017
Mar. 31, 2017
Sep. 01, 2016
Mar. 31, 2016
Cumulative Preferred Stock [Member]          
Preferred Stock, Shares Authorized   1,000,000 1,000,000    
Preferred Stock, Par or Stated Value Per Share   $ 1 $ 1    
Preferred Stock, Shares Issued   0 0   0
2016 Restricted Stock Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       500,000  
2016 Restricted Stock Plan [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 210,000 0      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 1,444,800        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years        
Allocated Share-based Compensation Expense     $ 72,240