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Note 4 - Property and Equipment (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Depreciation $ 9,092 $ 13,606 $ 13,272
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation $ 300 $ 4,200  
Asset Impairment Charges     $ 27,500