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Note 7 - Leases (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Lease, Right-of-Use Asset, Amortization Expense $ 882,000 $ 848,000
Operating Lease, Weighted Average Remaining Lease Term (Year) 8 years 2 months 12 days  
Operating Lease, Weighted Average Discount Rate, Percent 3.13%