Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Non-vested Stock to Directors (Details)

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Note 6 - Stock-based Compensation - Non-vested Stock to Directors (Details) - $ / shares
9 Months Ended 12 Months Ended
Dec. 31, 2017
Apr. 03, 2016
Grant Date (in shares)   41,205
Non Employee Directors [Member] | August 9 2017 [Member]    
Fair Value Per Share (in dollars per share) $ 5.50  
Grant Date (in shares) 28,000  
Non Employee Directors [Member] | August 10, 2016 [Member]    
Fair Value Per Share (in dollars per share) $ 10.08  
Grant Date (in shares) 28,000  
Non Employee Directors [Member] | August 12, 2015 [Member]    
Fair Value Per Share (in dollars per share) $ 8.20  
Grant Date (in shares) 28,000  
Non Employee Directors [Member] | August 11, 2014 [Member]    
Fair Value Per Share (in dollars per share) $ 7.97  
Grant Date (in shares) 28,000