Note E - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Operating lease right-of-use asset	$ 1,193	$ 1,270
Total right-of-use assets	1,604	1,700
Finance lease liability, current	81	107
Total lease liabilities	1,274	1,430
Other Noncurrent Assets [Member]
Operating lease right-of-use asset	1,193	1,270
Property, Plant and Equipment, Net [Member]
Finance lease right-of-use asset	411	430
Accounts Payable and Accrued Liabilities [Member]
Operating lease liability, current	66	101
Current Portion of Financing Lease [Member]
Finance lease liability, current	81	107
Other Noncurrent Liabilities [Member]
Operating lease liability, non-current	1,127	1,168
Finance lease liability, non-current	$ 0	$ 54