Note E - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Operating lease right-of-use asset	$ 1,219	$ 1,270
Total right-of-use assets	1,636	1,700
Finance lease liability, current	108	107
Total lease liabilities	1,327	1,430
Other Noncurrent Assets [Member]
Operating lease right-of-use asset	1,219	1,270
Property, Plant and Equipment, Net [Member]
Finance lease right-of-use asset	417	430
Accounts Payable and Accrued Liabilities [Member]
Operating lease liability, current	80	101
Current Portion of Financing Lease [Member]
Finance lease liability, current	108	107
Other Noncurrent Liabilities [Member]
Operating lease liability, non-current	1,139	1,168
Finance lease liability, non-current	$ 0	$ 54