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Note 2 - Supplemental Balance-sheet Information - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Goodwill $ 1,907 $ 1,907
Customer Relationships [Member]    
Gross carrying amount 906 906
Accumulated amortization (418) (327)
Computer Software, Intangible Asset [Member]    
Gross carrying amount 234 234
Accumulated amortization (216) (169)
Trade Names [Member]    
Gross carrying amount 60 60
Accumulated amortization $ (5)