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Note 14 - Earnings Per Share (Details Textual) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Payment Arrangement, Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 41,000 142,600 76,000 81,800