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Note 12 - Subsequent Event (Details Textual) - Subsequent Event [Member]
Jul. 24, 2018
$ / shares
Dividends Payable, Date Declared Jul. 24, 2018
Dividends Payable, Date to be Paid Aug. 29, 2018
Dividends Payable, Date of Record Aug. 08, 2018
Common Class A [Member]  
Common Stock, Dividends, Per Share, Declared $ 0.12
Common Class B [Member]  
Common Stock, Dividends, Per Share, Declared $ 0.12