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Note 9 - Other Intangible Assets - Definite Lived Intangible Assets (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Estimated useful life (Year)
Gross amount $ 2,987 $ 2,987
Accumulated amortization (2,908) (2,669)
Net balance $ 79 $ 318
Patents [Member]    
Estimated useful life (Year) 14 years 14 years
Gross amount $ 429 $ 429
Accumulated amortization (429) (429)
Net balance
Noncompete Agreements [Member]    
Estimated useful life (Year) 5 years 5 years
Gross amount $ 512 $ 512
Accumulated amortization (496) (449)
Net balance $ 16 $ 63
Customer Lists [Member]    
Estimated useful life (Year) 5 years 5 years
Gross amount $ 2,046 $ 2,046
Accumulated amortization (1,983) (1,791)
Net balance $ 63 $ 255