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Note 18 - Fair Value Measurements (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Equity Securities without Readily Determinable Fair Value, Number of Securities 1  
Equity Securities without Readily Determinable Fair Value, Amount   $ 250,000
Estimated Selling Costs of Impaired Loans $ 492,000 $ 1,300,000