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Note A - Basis of Presentation and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Numerator    
Net income $ 2,490 $ 1,213
Denominator    
Basic weighted average common shares outstanding (in shares) 6,558,395 6,520,667
Dilutive effect of stock options (in shares) 89,000 174,000
Diluted weighted average common shares outstanding (in shares) 6,646,963 6,695,319
Basic net income per common share (in dollars per share) $ 0.38 $ 0.19
Diluted net income per common share (in dollars per share) $ 0.37 $ 0.18