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		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Numerator
Net income	$ 3,023	$ 788	$ 6,104	$ 2,356
Denominator
Basic weighted average common shares outstanding (in shares)	6,510,902	6,747,848	6,513,821	6,797,256
Dilutive effect of stock options (in shares)	52,000	12,000	115,000	35,000
Diluted weighted average common shares outstanding (in shares)	6,562,577	6,760,483	6,628,883	6,832,268
Basic net income per common share (in dollars per share)	$ 0.46	$ 0.12	$ 0.94	$ 0.35
Diluted net income per common share (in dollars per share)	$ 0.46	$ 0.12	$ 0.92	$ 0.35