Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Intangible Assets - Summary of Intangible Assets (Details)

v3.7.0.1
Note 3 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Gross Carrying Amount $ 4,906 $ 4,897
Accumulated Amortization (3,153) (3,059)
Net Carrying Amount 1,753 1,838
Patents [Member]    
Gross Carrying Amount 586 577
Accumulated Amortization (282) (274)
Net Carrying Amount $ 304 303
Patents [Member] | Minimum [Member]    
Useful Lives (Year) 3 years  
Patents [Member] | Maximum [Member]    
Useful Lives (Year) 17 years  
Computer Software, Intangible Asset [Member]    
Useful Lives (Year) 3 years  
Gross Carrying Amount $ 405 405
Accumulated Amortization (388) (383)
Net Carrying Amount $ 17 22
Customer Relationships [Member]    
Useful Lives (Year) 12 years  
Gross Carrying Amount $ 3,370 3,370
Accumulated Amortization (2,042) (1,974)
Net Carrying Amount $ 1,328 1,396
Permits [Member]    
Useful Lives (Year) 10 years  
Gross Carrying Amount $ 545 545
Accumulated Amortization (441) (428)
Net Carrying Amount $ 104 $ 117