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		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2023
Numerator
Net (loss) income	$ (1,578)	$ (2,381)	$ (5,343)	$ (5,343)	$ 485	$ 485
Denominator
Basic weighted average common shares outstanding (in shares)	5,867,528	5,816,058	5,856,000	5,855,930	5,867,000	5,867,400
Dilutive effect of restricted stock (in shares)	0	0	0		18,000
Diluted weighted average common shares outstanding (in shares)	5,867,528	5,816,058	5,856,000	5,855,930	5,885,000	5,885,116
Basic net (loss) income per common share (in dollars per share)	$ (0.27)	$ (0.41)	$ (0.91)	$ (0.91)	$ 0.08	$ 0.08
Diluted net (loss) income per common share (in dollars per share)	$ (0.27)	$ (0.41)	$ (0.91)	$ (0.91)	$ 0.08	$ 0.08