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Note 14 - Guarantees, Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Credit Losses Associated With Derivative Contracts $ 0 $ 0  
Securities Committed to Purchase Amount 0   $ 0
Securities Committed to Sell Amount 0   $ 0
Construction Management Agreement [Member]      
Construction and Development Costs 8,200    
Guarantor Obligations, Maximum Exposure, Undiscounted 3,500    
Development in Process, Estimated Additional Expenditures 1,700    
Estimated Depreciation $ 500