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Note 4 - Supplemental Balance Sheet Information - Components of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment, gross	$ 65,193	$ 64,526
Less – Accumulated Depreciation	(57,194)	(55,488)
Total	7,999	9,038
Land [Member]
Property, plant and equipment, gross	123	123
Building and Building Improvements [Member]
Property, plant and equipment, gross	7,757	7,490
Machinery and Equipment [Member]
Property, plant and equipment, gross	49,722	49,609
Furniture and Fixtures [Member]
Property, plant and equipment, gross	1,947	1,974
Computer Equipment [Member]
Property, plant and equipment, gross	5,223	4,585
Construction in Progress [Member]
Property, plant and equipment, gross	$ 421	$ 745

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
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-SubTopic 10
-Section 50
-Paragraph 1
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-Section S99
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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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-Subparagraph (b)
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+ References

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