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, 2020	Sep. 30, 2019
Numerator
Net income	$ 2,258	$ 96
Denominator
Basic weighted average common shares outstanding (in shares)	6,418,093	6,841,241
Dilutive effect of stock options and restricted stock (in shares)	53,000	144,000
Diluted weighted average common shares outstanding (in shares)	6,470,978	6,985,226
Basic net income per common share (in dollars per share)	$ 0.35	$ 0.01
Diluted net income per common share (in dollars per share)	$ 0.35	$ 0.01