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Note 3 - Net Earnings Per Share (Details) - Basic and Diluted Earnings per Common Share (USD $)
3 Months Ended 6 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Basic and Diluted Earnings per Common Share [Abstract]        
Net Earnings $ 1,818,306 $ 456,110 $ 1,891,103 $ 594,621
Earnings Per Share:        
Basic $ 0.77 $ 0.19 $ 0.80 $ 0.24
Diluted $ 0.77 $ 0.18 $ 0.80 $ 0.24
Weighted Average Shares Outstanding:        
Basic 2,355,028 2,446,286 2,355,028 2,446,286
Diluted 2,375,398 2,485,246 2,375,660 2,477,047