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Note D - Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating lease cost $ 1,913 $ 2,119 $ 4,032 $ 4,484
Amortization of right-of-use assets 49 65 98 132
Interest on lease liabilities 8 13 15 27
Total Finance lease cost 57 78 113 159
Variable lease cost 634 722 1,554 1,642
Sublease income (169) 0 (358) 0
Total lease cost, net $ 2,435 $ 2,919 5,341 6,285
Operating cash flows from operating leases     7,637 10,661
Operating cash flows from finance leases     13 23
Financing cash flows from finance leases     $ 112 $ 191
Weighted Average Remaining Lease term, Operating leases (Year) 5 years 9 months 18 days 3 years 2 months 12 days 5 years 9 months 18 days 3 years 2 months 12 days
Weighted Average Remaining Lease term, Finance leases (Year) 2 years 6 months 3 years 2 years 6 months 3 years
Weighted Average Discount Rate, Operating leases 3.53% 4.66% 3.53% 4.66%
Weighted Average Discount Rate, Finance leases 5.33% 6.34% 5.33% 6.34%