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Note 5 - Property and Equipment (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 04, 2016
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation   $ 600 $ 600 $ 300  
Denver Facility [Member]          
Proceeds from Sale of Property, Plant, and Equipment $ 13,900   13,914
Gain (Loss) on Disposition of Property Plant Equipment   $ 7,900 $ 7,860