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Note 4 - Construction Joint Ventures (Details Textual) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Construction Backlog Attributable to Project Performed by Joint Ventures	$ 47		$ 53
Steve P. Rados, Inc. [Member]
Equity Method Investment, Ownership Percentage	50.00%
Granite Construction Corporation [Member]
Equity Method Investment, Ownership Percentage		49.00%

X

- Definition

Amount of construction backlog attributable to project performed by joint ventures.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Details

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- Details

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