Note 4 - Goodwill and Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Cost	$ 13,339	$ 13,155
Accumulated amortization	(5,678)	(5,324)
Intangible assets, net	7,661	7,831
Patents [Member]
Cost	2,050	2,021
Accumulated amortization	(527)	(508)
Intangible assets, net	1,523	1,513
Trademarks and Trade Names [Member]
Cost	3,269	3,219
Accumulated amortization	(936)	(886)
Intangible assets, net	2,333	2,333
Developed Technology Rights [Member]
Cost	6,017	5,923
Accumulated amortization	(3,343)	(3,125)
Intangible assets, net	2,674	2,798
Customer Relationships [Member]
Cost	704	693
Accumulated amortization	(391)	(366)
Intangible assets, net	313	327
Internally Developed Software [Member]
Cost	1,085	1,085
Accumulated amortization	(290)	(263)
Intangible assets, net	795	822
Other Intangible Assets [Member]
Cost	214	214
Accumulated amortization	(191)	(176)
Intangible assets, net	$ 23	$ 38