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Note 17 - Segment Data - Net Sales by Market (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 37,220	$ 35,684	$ 37,886	$ 37,053	$ 36,507	$ 37,220	$ 37,902	$ 34,503	$ 147,843	$ 146,132	$ 138,850
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									100.00%	100.00%	100.00%
Medical [Member]
Net sales									$ 69,910	$ 64,687	$ 57,297
Medical [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									47.30%	44.30%	41.30%
Automotive [Member]
Net sales									$ 23,118	$ 27,217	$ 26,879
Automotive [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									15.70%	18.60%	19.40%
Consumer [Member]
Net sales									$ 22,486	$ 21,541	$ 17,274
Consumer [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									15.20%	14.70%	12.40%
Aerospace & Defense [Member]
Net sales									$ 11,536	$ 10,967	$ 13,154
Aerospace & Defense [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									7.80%	7.50%	9.50%
Electronics [Member]
Net sales									$ 10,842	$ 10,979	$ 13,218
Electronics [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									7.30%	7.50%	9.50%
Industrial [Member]
Net sales									$ 9,951	$ 10,741	$ 11,028
Industrial [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Percentage of concentration risk									6.70%	7.40%	7.90%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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