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Note 16 - Related Party Transactions (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Related Party Transaction, Expenses from Transactions with Related Party $ 1.9 $ 1.6 $ 1.3
Related Party Transaction, Amounts of Transaction $ 1.0    
Limited Liability Company A [Member]      
Ownership Interest In Trust 51.00%