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