Note N - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net earnings	$ 3,513	$ 7,690	$ 2,471	$ 11,184	$ 11,203	$ 13,655
Less: Allocation to unvested restricted stock units	41		42		131	236
Net earnings attributable to common shareholders	$ 3,472		$ 2,429		$ 11,072	$ 13,419
Weighted average common shares outstanding (in shares)	7,288,906		7,243,080		7,288,906	7,157,073