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Note 7 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, plant and equipment, gross	$ 161,273	$ 153,787
Less accumulated depreciation	(93,146)	(80,312)
	68,127	73,475
Construction Equipment [Member]
Property, plant and equipment, gross	121,441	114,724
Transportation Equipment [Member]
Property, plant and equipment, gross	19,017	18,056
Building [Member]
Property, plant and equipment, gross	12,771	10,860
Office Equipment [Member]
Property, plant and equipment, gross	3,108	2,810
Leasehold Improvements [Member]
Property, plant and equipment, gross	914	894
Construction in Progress [Member]
Property, plant and equipment, gross	313	1,986
Land [Member]
Property, plant and equipment, gross	3,509	4,257
Water Rights [Member]
Property, plant and equipment, gross	$ 200	$ 200

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
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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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-Name Accounting Standards Codification
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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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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Subparagraph (SX 210.7-03(a)(8))
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