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		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Numerator
Net income	$ 2,181	$ (1,318)	$ 4,740	$ 116
Denominator
Basic weighted average common shares outstanding (in shares)	6,807,979	6,615,355	6,786,470	6,610,937
Dilutive effect of stock options and restricted stock (in shares)	191,000		196,000	226,000
Diluted weighted average common shares outstanding (in shares)	6,999,223	6,615,355	6,982,083	6,836,567
Basic net income (loss) per common share (in dollars per share)	$ 0.32	$ (0.20)	$ 0.70	$ 0.02
Diluted net income (loss) per common share (in dollars per share)	$ 0.31	$ (0.20)	$ 0.68	$ 0.02