Note D - Leases (Details Textual) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)		Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
Operating Lease, Right-of-Use Asset	$ 13,410		$ 17,679
Operating Lease, Liability, Total	$ 16,953	[1]	19,740
Lessee, Lease, Termination Period (Year)	1 year
Finance Lease, Right-of-Use Asset, after Accumulated Amortization, Total	$ 998		$ 1,138
Finance Lease, Right-of-Use Asset, Accumulated Depreciation	$ 500
Lessee, Operating Lease, Lease Not yet Commenced, Number	1
Minimum [Member]
Lessee, Lease Remaining Lease Term (Year)	1 year
Minimum [Member] | Sublease Fullerton, Jacksonville and Manila Facilities [Member]
Lessee, Operating Sublease, Lease Term (Month)	150 days
Maximum [Member]
Lessee, Lease Remaining Lease Term (Year)	6 years
Lessee, Lease, Renewal Term (Year)	5 years
Maximum [Member] | Sublease Fullerton, Jacksonville and Manila Facilities [Member]
Lessee, Operating Sublease, Lease Term (Month)	2 years 330 days
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset				$ 22,800
Operating Lease, Liability, Total				$ 23,900

[1] Non-cancelable sublease proceeds for the remainder of the fiscal year ending December 31, 2020 and the fiscal years ending December 31, 2021, 2022, and 2023 of $254k, $647k, $540k, and $154k, respectively, are not included in the table above.