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Note 8 - Leases - Leases Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Amortization of finance lease assets $ 268 $ 150 $ 709 $ 435
Interest on finance lease liabilities 92 64 265 139
Total finance lease costs 360 214 974 574
Operating lease cost 741 764 2,260 2,340
Short-term lease cost 166 196 540 483
Variable lease cost [1] 220 198 647 586
Sublease income (47) (45) (140) (136)
Total operating lease costs 1,080 1,113 3,307 3,273
Total lease cost $ 1,440 $ 1,327 4,281 3,847
Operating cash outflow from operating leases     $ 2,722 $ 2,638
Weighted-average remaining lease term-finance leases at end of period (in years) (Year) 2 years 1 year 8 months 12 days 2 years 1 year 8 months 12 days
Weighted-average remaining lease term-operating leases at end of period (in years) (Year) 9 years 1 month 6 days 10 years 2 months 12 days 9 years 1 month 6 days 10 years 2 months 12 days
Weighted-average discount rate-finance leases at end of period 6.40% 8.90% 6.40% 8.90%
Weighted-average discount rate-operating leases at end of period 8.60% 8.90% 8.60% 8.90%
[1] Variable lease costs consist primarily of taxes, insurance, utilities, and common area or other maintenance costs for the Company’s leased facilities and equipment.