Note D - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020		Dec. 31, 2019
Right-of-use Assets, operating leases	$ 23,793		$ 17,679
Right-of-use Assets, finance leases	957		1,138
Right-of-use Assets, total	24,750		18,817
Short-term lease liabilities, total	6,663		7,616
Long-term lease liabilities, total	21,295		13,078
Total Lease Liabilities, finance leases	630
Short-term Lease Liabilities [Member]
Short-term lease liabilities, operating leases	6,436		7,226
Short-term lease liabilities, finance leases	227		390
Short-term lease liabilities, total	6,663		7,616
Long-term Lease Liabilities [Member]
Long-term lease liabilities, operating leases	20,892		12,514
Long-term lease liabilities, finance leases	403		564
Long-term lease liabilities, total	21,295		13,078
Short-term Lease Liabilities and Long-term Lease Liabilities [Member]
Total Lease Liabilities, operating leases	27,328	[1]	19,740
Total Lease Liabilities, finance leases	630		954
Total Lease Liabilities, total	$ 27,958		$ 20,694

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