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Note 6 - Property and Equipment - Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, plant and equipment, gross	$ 160,875	$ 161,273
Less accumulated depreciation	(95,054)	(93,146)
Total property and equipment, net	65,821	68,127
Construction Equipment [Member]
Property, plant and equipment, gross	122,097	121,441
Transportation Equipment [Member]
Property, plant and equipment, gross	18,161	19,017
Building [Member]
Property, plant and equipment, gross	12,786	12,771
Office Equipment [Member]
Property, plant and equipment, gross	3,108	3,108
Leasehold Improvements [Member]
Property, plant and equipment, gross	914	914
Construction in Progress [Member]
Property, plant and equipment, gross	100	313
Land [Member]
Property, plant and equipment, gross	3,509	3,509
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
-Topic 210
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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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