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Note 2 - Leases - Lease Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Amortization expense $ 422 $ 425
Interest expense 230 261
Operating lease expense 1,406 1,406
Variable lease expense 315 317
Total lease expense $ 2,373 $ 2,409