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, 2023	Jun. 30, 2022
Numerator
Net income	$ 2,522	$ 10,712
Denominator
Basic weighted average common shares outstanding (in shares)	5,863,083	6,117,044
Dilutive effect of stock options and restricted stock shares (in shares)	14,000	38,000
Diluted weighted average common shares outstanding (in shares)	5,877,559	6,155,118
Basic net income per common share (in dollars per share)	$ 0.43	$ 1.75
Diluted net income per common share (in dollars per share)	$ 0.43	$ 1.74