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	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Numerator
Net income	$ 10,712	$ 10,768
Denominator
Basic weighted average common shares outstanding (in shares)	6,117,044	6,290,689
Dilutive effect of stock options and restricted stock shares (in shares)	38,000	88,000
Diluted weighted average common shares outstanding (in shares)	6,155,118	6,379,486
Basic net income per common share (in dollars per share)	$ 1.75	$ 1.71
Diluted net income per common share (in dollars per share)	$ 1.74	$ 1.69