Note D - Leases - Maturities of Finance and Operating Lease Liabilities (Details) - USD ($) $ in Thousands		Mar. 31, 2021		Dec. 31, 2020
Remainder of 2021, operating leases	[1]	$ 5,869
Remainder of 2021, finance leases		189
2022, operating leases	[1]	6,734
2022, finance leases		209
2023, operating leases	[1]	4,760
2023, finance leases		167
2024, operating leases	[1]	3,312
2024, finance leases		48
2025, operating leases	[1]	1,574
2025, finance leases		6
2026, operating leases	[1]	7,505
2026, finance leases
Total future minimum lease payments, operating leases	[1]	29,754
Total future minimum lease payments, finance leases		619
Less: Imputed interest, operating leases	[1]	2,617
Less: Imputed interest, finance leases		44
Total lease liabilities, finance leases		575
Short-term Lease Liabilities and Long-term Lease Liabilities [Member]
Total lease liabilities, operating leases		27,137	[1]	$ 27,328
Total lease liabilities, finance leases		$ 575		$ 630

[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.