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Note 4 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Property and equipment, at cost	$ 376,710	$ 374,242
Accumulated depreciation	(229,062)	(218,476)
Net property and equipment	$ 147,648	155,766
Minimum [Member]
Depreciable lives (Year)	2 years
Maximum [Member]
Depreciable lives (Year)	30 years
Land [Member]
Property and equipment, at cost	$ 15,881	16,001
Land Improvements [Member]
Property and equipment, at cost	$ 3,270	3,133
Land Improvements [Member] | Minimum [Member]
Depreciable lives (Year)	5 years
Land Improvements [Member] | Maximum [Member]
Depreciable lives (Year)	10 years
Building and Building Improvements [Member]
Property and equipment, at cost	$ 131,655	133,010
Building and Building Improvements [Member] | Minimum [Member]
Depreciable lives (Year)	7 years
Building and Building Improvements [Member] | Maximum [Member]
Depreciable lives (Year)	30 years
Machinery and Equipment [Member]
Property and equipment, at cost	$ 184,683	185,676
Machinery and Equipment [Member] | Minimum [Member]
Depreciable lives (Year)	2 years
Machinery and Equipment [Member] | Maximum [Member]
Depreciable lives (Year)	15 years
Furniture and Fixtures [Member]
Property and equipment, at cost	$ 6,298	6,311
Furniture and Fixtures [Member] | Minimum [Member]
Depreciable lives (Year)	3 years
Furniture and Fixtures [Member] | Maximum [Member]
Depreciable lives (Year)	7 years
Software and Software Development Costs [Member]
Property and equipment, at cost	$ 28,677	27,848
Depreciable lives (Year)	5 years
Software and Software Development Costs [Member] | Minimum [Member]
Depreciable lives (Year)	2 years
Software and Software Development Costs [Member] | Maximum [Member]
Depreciable lives (Year)	5 years
Vehicles [Member]
Property and equipment, at cost	$ 1,746	1,456
Vehicles [Member] | Minimum [Member]
Depreciable lives (Year)	2 years
Vehicles [Member] | Maximum [Member]
Depreciable lives (Year)	5 years
Construction in Progress [Member]
Property and equipment, at cost	$ 4,500	$ 807

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)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: 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)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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(14))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(8))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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