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Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment, gross	$ 66,711	$ 65,193
Less – Accumulated Depreciation	(59,141)	(57,194)
Total	7,570	7,999
Land [Member]
Property, plant and equipment, gross	123	123
Building and Building Improvements [Member]
Property, plant and equipment, gross	7,858	7,757
Machinery and Equipment [Member]
Property, plant and equipment, gross	50,852	49,722
Furniture and Fixtures [Member]
Property, plant and equipment, gross	2,005	1,947
Computer Equipment [Member]
Property, plant and equipment, gross	5,338	5,223
Construction in Progress [Member]
Property, plant and equipment, gross	$ 535	$ 421

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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X

- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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