Note A - Organization 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
	Sep. 30, 2022	Sep. 30, 2021
Numerator
Net income	$ 1,053	$ 3,256
Denominator
Basic weighted average common shares outstanding (in shares)	5,919,649	6,287,627
Dilutive effect of stock options and restricted stock (in shares)	23,000	63,000
Diluted weighted average common shares outstanding (in shares)	5,943,446	6,351,345
Basic net income per common share (in dollars per share)	$ 0.18	$ 0.52
Diluted net income per common share (in dollars per share)	$ 0.18	$ 0.51