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Note 6 - Leases (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating Lease, Right-of-Use Asset, Amortization Expense $ 221,000 $ 212,000 $ 660,000 $ 636,000
Operating Lease, Weighted Average Remaining Lease Term (Year) 8 years 4 months 24 days   8 years 4 months 24 days  
Operating Lease, Weighted Average Discount Rate, Percent 3.13%   3.13%