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, 2019	Jun. 30, 2018
Numerator
Net income	$ 6,541	$ 5,051
Denominator
Basic weighted average common shares outstanding (in shares)	6,809,306	6,640,583
Dilutive effect of stock options and restricted stock shares (in shares)	289,000	245,000
Diluted weighted average common shares outstanding (in shares)	7,097,678	6,886,126
Basic net income per common share (in dollars per share)	$ 0.96	$ 0.76
Diluted net income per common share (in dollars per share)	$ 0.92	$ 0.73