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Note 16 - Subsequent Events (Details Textual) - Subsequent Event [Member]
1 Months Ended
Apr. 30, 2019
$ / shares
Common Stock, Dividends, Per Share, Declared $ 0.16
Dividends Payable, Date to be Paid Jun. 14, 2019
Dividends Payable, Date of Record May 31, 2019