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Note 15 - Earnings Per Share (Details Textual) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Preferred Stock, Dividend Rate, Percentage 5.00%    
Share-based Payment Arrangement, Option [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 0 0 15,000