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Note 8 - Leases - Lease Expense and Other Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Amortization of ROU Assets $ 49 $ 0 $ 86 $ 0
Interest on finance lease liabilities 8 0 15 0
Finance lease expense 57 0 101 0
Operating lease expense 595 521 1,169 1,043
Short-term lease expense 0 4 0 6
Variable lease expense 74 60 137 112
Total lease expense $ 726 $ 585 $ 1,407 $ 1,161
Operating leases (Year) 16 years 1 month 6 days 17 years 3 months 18 days 16 years 1 month 6 days 17 years 3 months 18 days
Financing leases (Year) 3 years 8 months 12 days   3 years 8 months 12 days  
Operating leases 4.10% 4.10% 4.10% 4.10%
Financing leases 5.00% 0.00% 5.00% 0.00%
Right-of-use assets obtained in exchange for operating lease liabilities as of January 1, 2019 $ 593 $ 497 $ 1,137 $ 994
Operating cash flows from financing leases $ 59 $ 0 $ 110 $ 0