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Note 12 - Certain Relationships and Related Transactions (Details Textual) - USD ($)
$ in Millions
24 Months Ended
Dec. 31, 2014
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2013
Investment in Subsidiary [Member] | Management and Accredited Investors [Member]        
Related Party Transaction, Amounts of Transaction $ 1.0      
AWMS Holdings, LLC [Member]        
Equity Method Investment, Ownership Percentage   47.00% 47.00%  
Equity Method Investments 3.4     $ 3.4
Proceeds from Issuance of Private Placement $ 3.8