Note 5 - Goodwill and Other Intangible Assets - Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible asset amortization	$ 1,902	$ 1,841	$ 1,923
Trademarks and Trade Names [Member]
Intangible asset amortization	172	316	434
Customer-Related Intangible Assets [Member]
Intangible asset amortization	660	638	669
Developed Technology Rights [Member]
Intangible asset amortization	201	198	193
Technology-Based Intangible Assets [Member]
Intangible asset amortization	264	255	269
Computer Software, Intangible Asset [Member]
Intangible asset amortization	191	83	76
Certification Marks [Member]
Intangible asset amortization	413	343	260
Other Intangible Assets [Member]
Intangible asset amortization	$ 1	$ 8	$ 22