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Note 10 - Basic and Diluted Earnings Per Common Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 734,388 260,700 734,388 260,700