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Note 9 - Other Intangible Assets - Carrying Value of Definite Lived Intangible Assets (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Gross amount $ 2,987 $ 2,987
Accumulated amortization (2,828) (2,669)
Net balance $ 159 $ 318
Estimated useful life (in years) (Year)
Patents [Member]    
Gross amount $ 429 $ 429
Accumulated amortization (429) (429)
Net balance
Estimated useful life (in years) (Year) 14 years 14 years
Noncompete Agreements [Member]    
Gross amount $ 512 $ 512
Accumulated amortization (481) (449)
Net balance $ 31 $ 63
Estimated useful life (in years) (Year) 5 years 5 years
Customer Lists [Member]    
Gross amount $ 2,046 $ 2,046
Accumulated amortization (1,918) (1,791)
Net balance $ 128 $ 255
Estimated useful life (in years) (Year) 5 years 5 years