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
	Sep. 30, 2021	Sep. 30, 2020
Numerator
Net income	$ 3,256	$ 2,258
Denominator
Basic weighted average common shares outstanding (in shares)	6,287,627	6,418,093
Dilutive effect of stock options and restricted stock (in shares)	63,000	53,000
Diluted weighted average common shares outstanding (in shares)	6,351,345	6,470,978
Basic net income per common share (in dollars per share)	$ 0.52	$ 0.35
Diluted net income per common share (in dollars per share)	$ 0.51	$ 0.35