Note A - Basis of Presentation and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income per Common Share (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Numerator
Net income	$ 1,868	$ 1,081	$ 3,081	$ 1,568
Denominator
Basic weighted average common shares outstanding (in shares)	6,509,893	6,808,229	6,515,280	6,821,960
Dilutive effect of stock options (in shares)	119,000	54,000	147,000	46,000
Diluted weighted average common shares outstanding (in shares)	6,628,752	6,862,369	6,662,036	6,868,160
Basic net income per common share (in dollars per share)	$ 0.29	$ 0.16	$ 0.47	$ 0.23
Diluted net income per common share (in dollars per share)	$ 0.28	$ 0.16	$ 0.46	$ 0.23