Note E - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023
Operating lease right-of-use asset	$ 1,244	$ 1,270
Total right-of-use assets	1,668	1,700
Finance lease liability, current	107	107
Total lease liabilities	1,379	1,430
Other Noncurrent Assets [Member]
Operating lease right-of-use asset	1,244	1,270
Property, Plant and Equipment, Net [Member]
Finance lease right-of-use asset	424	430
Accounts Payable and Accrued Liabilities [Member]
Operating lease liability, current	94	101
Current Portion of Financing Lease [Member]
Finance lease liability, current	107	107
Other Noncurrent Liabilities [Member]
Operating lease liability, non-current	1,151	1,168
Finance lease liability, non-current	$ 27	$ 54