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Note 4 - Supplemental Balance Sheet Information (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Construction in Progress, Gross $ 5,136 $ 170
Depreciation 2,005 2,223
Goodwill, Impairment Loss 0 0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 400  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 379  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 367  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 348  
Finite-Lived Intangible Assets, Amortization Expense, Year Five 334  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) $ 0 $ 0