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Note 4 - Supplemental Disclosure for Earnings Per Share (Details Textual) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Restricted Stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 0 0 0