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, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Numerator
Net income	$ 1,847	$ 3,632	$ 5,103	$ 5,890
Denominator
Basic weighted average common shares outstanding (in shares)	6,211,954	6,270,419	6,249,791	6,344,256
Dilutive effect of stock options and restricted stock (in shares)	44,000	135,000	54,000	94,000
Diluted weighted average common shares outstanding (in shares)	6,256,498	6,405,308	6,303,921	6,438,143
Basic net income per common share (in dollars per share)	$ 0.30	$ 0.58	$ 0.82	$ 0.93
Diluted net income per common share (in dollars per share)	$ 0.30	$ 0.57	$ 0.81	$ 0.91