Note 9 - Segment Reporting - Net Sales by Market (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 42,931	$ 37,053
Percentage of concentration risk	100.00%	100.00%
Medical [Member]
Net sales	$ 24,138	$ 17,456
Percentage of concentration risk	56.20%	47.10%
Consumer [Member]
Net sales	$ 5,460	$ 4,441
Percentage of concentration risk	12.70%	12.00%
Automotive [Member]
Net sales	$ 5,356	$ 6,719
Percentage of concentration risk	12.50%	18.10%
Electronics [Member]
Net sales	$ 2,871	$ 2,909
Percentage of concentration risk	6.70%	7.90%
Industrial [Member]
Net sales	$ 2,627	$ 2,468
Percentage of concentration risk	6.10%	6.70%
Aerospace & Defense [Member]
Net sales	$ 2,479	$ 3,060
Percentage of concentration risk	5.80%	8.30%

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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