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Note G - Stock Based Compensation (Details Textual) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 01, 2016
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Expense	$ 0.2	$ 0.1
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 0.2
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 2 months 12 days
2016 Restricted Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)			500,000
2016 Restricted Stock Plan [Member] \| Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)	122,485