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Note 6 - Leases - Lease Costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating lease costs $ 1,369 $ 1,270 $ 1,336
Short-term leases 2,529 3,483 4,840
Variable lease costs 412 392 313
Sublease income 0 0 (3)
Net lease cost $ 4,310 $ 5,145 $ 6,486