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Note 5 - Supplemental Disclosure for Earnings Per Share (Details Textual) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0 0