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Note 17 - Related Party Transactions (Details Textual) - Director [Member] - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Legal Services, Related Party [Member]    
Related Party Transaction, Expenses from Transactions with Related Party $ 0 $ 188,000
Payments for Legal Services [Member]    
Related Party Transaction, Expenses from Transactions with Related Party 65,000 33,000
Related Law Firm [Member]    
Due to Related Parties $ 0 $ 163,000