Note D - Leases - Maturities of Finance and Operating Lease Liabilities (Details) (Parentheticals) $ in Thousands	Mar. 31, 2021 USD ($)
Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year	$ 647
Lessor, Operating Lease, Payment to be Received, Year One	540
Lessor, Operating Lease, Payment to be Received, Year Two	154
Sublease Fullerton, Jacksonville and Manila Facilities [Member]
Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year	647	[1]
Lessor, Operating Lease, Payment to be Received, Year One	540	[1]
Lessor, Operating Lease, Payment to be Received, Year Two	$ 154	[1]

[1] Non-cancelable sublease proceeds for the remainder of the fiscal year ending December 31, 2021 and the fiscal years ending December 31, 2022 and 2023 of $647k, $540k, and $154k, respectively, are not included in the table above.