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Note 6 - Leases (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating Lease, Right-of-Use Asset, Amortization Expense $ 221,000 $ 219,000
Operating Lease, Weighted Average Remaining Lease Term (Year) 8 years 1 month 6 days  
Operating Lease, Weighted Average Discount Rate, Percent 3.13%