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, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Numerator
Net income	$ 476	$ 2,181	$ 572	$ 4,740
Denominator
Basic weighted average common shares outstanding (in shares)	6,795,269	6,807,979	6,818,249	6,786,470
Dilutive effect of stock options and restricted stock (in shares)	91,000	191,000	117,000	196,000
Diluted weighted average common shares outstanding (in shares)	6,885,934	6,999,223	6,935,580	6,982,083
Basic net income per common share (in dollars per share)	$ 0.07	$ 0.32	$ 0.08	$ 0.70
Diluted net income per common share (in dollars per share)	$ 0.07	$ 0.31	$ 0.08	$ 0.68