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Note 9 - Other Intangible Assets - Carrying Value of Definite Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Gross amount $ 2,987 $ 2,987
Accumulated amortization (2,749) (2,669)
Net balance 238 318
Patents [Member]    
Gross amount 429 429
Accumulated amortization (429) (429)
Net balance
Noncompete Agreements [Member]    
Gross amount 512 512
Accumulated amortization (465) (449)
Net balance 47 63
Customer Lists [Member]    
Gross amount 2,046 2,046
Accumulated amortization (1,855) (1,791)
Net balance $ 191 $ 255