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Note 20 - Guarantees, Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Securities Committed to Purchase Amount $ 0 $ 0
Securities Committed to Sell Amount 0 0
Credit Losses Associated With Derivative Contracts 0 $ 0
Construction Management Agreement [Member]    
Construction and Development Costs 4,200  
Guarantor Obligations, Maximum Exposure, Undiscounted 7,100  
Development in Process, Estimated Additional Expenditures 2,200  
Estimated Depreciation $ 500