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Note 3 - Restatement - Effects of Restatement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 388,024	$ 184,673	$ 388,024	$ 184,673		$ 262,273
Short-term marketable securities	0	37,918	0	37,918		27,799
Receivables, net ($32,028, $29,564 and $30,336 related to CCJVs)	661,948	712,972	661,948	712,972		547,417
Contract assets ($27,528, $25,034 and $24,481 related to CCJVs)	159,939	206,407	159,939	206,407		211,441
Inventories	102,111	95,442	102,111	95,442		88,885
Equity in construction joint ventures	184,980	203,954	184,980	203,954		193,110
Other current assets ($13,634, $13,350 and $10,765 related to CCJVs)	48,300	51,925	48,300	51,925		46,016
Total current assets	1,545,302	1,493,291	1,545,302	1,493,291		1,376,941
Property and equipment, net ($25,765, $31,136 and $27,752 related to CCJVs)	536,256	542,796	536,256	542,796		542,297
Long-term marketable securities	5,700	10,000	5,700	10,000		5,000
Investments in affiliates	76,464	84,914	76,464	84,914		84,176
Goodwill	116,691	264,112	116,691	264,112		264,279
Right of use assets	68,276	70,472	68,276	70,472		72,534
Deferred income taxes, net	39,439	30,637	39,439	30,637		50,158
Other noncurrent assets	100,145	116,438	100,145	116,438		106,703
Total assets	2,488,273	2,612,660	2,488,273	2,612,660		2,502,088
Current maturities of long-term debt	8,253	8,263	8,253	8,263		8,244
Accounts payable ($50,503, $57,795 and $50,625 related to CCJVs)	385,259	399,743	385,259	399,743		400,775
Contract liabilities ($73,426, $20,994 and $16,951 related to CCJVs)	189,430	109,299	189,430	109,299		95,737
Accrued expenses and other current liabilities ($4,553, $2,415 and $4,477 related to CCJVs)	391,651	359,221	391,651	359,221		337,300
Total current liabilities	974,593	876,526	974,593	876,526		842,056
Long-term debt	405,644	394,841	405,644	394,841		356,108
Long-term lease liabilities	51,879	56,740	51,879	56,740		58,618
Deferred income taxes, net	3,417	4,652	3,417	4,652		3,754
Other long-term liabilities	63,741	58,433	63,741	58,433		63,136
Commitments and contingencies (Note 18)
Preferred stock, $0.01 par value, authorized 3,000,000 shares, none outstanding		0		0
Common stock, $0.01 par value, authorized 150,000,000 shares; issued and outstanding: 45,655,682 shares as of September 30, 2020, 45,503,805 shares as of December 31, 2019 and 46,741,263 shares as of September 30, 2019	457	468	457	468		456
Additional paid-in capital	554,303	567,033	554,303	567,033		549,307
Accumulated other comprehensive loss	(6,000)	(3,282)	(6,000)	(3,282)		(2,645)
Retained earnings	422,846	619,690	422,846	619,690		594,353
Total Granite Construction Incorporated shareholders’ equity	971,606	1,183,909	971,606	1,183,909		1,141,471
Non-controlling interests	17,393	37,559	17,393	37,559		36,945
Total equity	988,999	1,221,468	988,999	1,221,468	$ 1,090,760	1,178,416	$ 1,194,183	$ 1,289,354
Total liabilities and equity	2,488,273	2,612,660	2,488,273	2,612,660		$ 2,502,088
Total revenue	1,065,189	1,112,114	2,616,887	2,560,019
Total cost of revenue	939,192	989,556	2,378,748	2,389,565
Gross profit	125,997	122,558	238,139	170,454
Selling, general and administrative expenses	82,505	73,424	252,568	224,577
Acquisition and integration expenses	73	2,744	73	13,769
Gain on sales of property and equipment	(3,057)	(7,101)	(4,870)	(13,936)
Operating income (loss)	(85,801)	53,491	(166,322)	(53,956)
Interest income	(755)	(1,713)	(2,813)	(6,257)
Interest expense	6,359	4,839	17,902	13,011
Equity in income of affiliates, net	(2,353)	(6,275)	(4,415)	(10,159)
Other (income) expense, net	(1,967)	127	92	(2,394)
Total other income	1,284	(3,022)	10,766	(5,799)
Income (loss) before provision for (benefit from) income taxes	(87,085)	56,513	(177,088)	(48,157)
Provision for (benefit from) income taxes	11,272	11,747	(5,220)	(11,516)
Net income (loss)	(98,357)	44,766	(171,868)	(36,641)
Amount attributable to non-controlling interests	7,195	1,135	18,741	(4,170)
Net income (loss) attributable to Granite Construction Incorporated	$ (91,162)	$ 45,901	$ (153,127)	$ (40,811)
Basic (in dollars per share)	$ (2.00)	$ 0.98	$ (3.36)	$ (0.87)
Diluted (in dollars per share)	$ (2.00)	$ 0.97	$ (3.36)	$ (0.87)
Basic (in shares)	45,654	46,788	45,598	46,771
Diluted (in shares)	45,654	47,170	45,598	46,771
Net (loss) income			$ (171,868)	$ (36,641)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization			84,713	92,700
Gain on sales of property and equipment, net			(4,870)	(13,936)
Deferred income taxes			996	(2,150)
Stock-based compensation			5,203	8,924
Equity in net loss from unconsolidated joint ventures			38,529	93,274
Net income from affiliates				(10,159)
Other non-cash adjustments			2,071	4,630
Changes in assets and liabilities, net of the effect of an acquisition in 2019:
Receivables			(98,118)	(225,558)
Contract assets, net			144,558	(21,539)
Inventories			(13,226)	(6,178)
Contributions to unconsolidated construction joint ventures			(38,044)	(57,280)
Distributions from unconsolidated construction joint ventures and affiliates			9,279	13,181
Other assets, net			(6,208)	(10,390)
Accounts payable			(16,559)	143,678
Accrued expenses and other current liabilities, net			43,477	946
Net cash used in operating activities			138,666	(26,498)
Transportation [Member]
Total revenue	$ 623,999	$ 623,867	1,510,001	1,407,577
Total cost of revenue	569,677	577,002	1,399,113	1,376,561
Water [Member]
Total revenue	106,599	134,404	317,980	345,556
Total cost of revenue	94,042	121,767	283,497	314,471
Specialty [Member]
Total revenue	205,134	224,744	513,087	538,497
Total cost of revenue	171,842	186,158	465,234	464,858
Materials [Member]
Total revenue	129,457	129,099	275,819	268,389
Total cost of revenue	$ 103,631	104,629	$ 230,904	233,675
Previously Reported [Member]
Cash and cash equivalents		184,673		184,673
Short-term marketable securities		37,918		37,918
Receivables, net ($32,028, $29,564 and $30,336 related to CCJVs)		700,387		700,387
Contract assets ($27,528, $25,034 and $24,481 related to CCJVs)		233,925		233,925
Inventories		95,442		95,442
Equity in construction joint ventures		209,765		209,765
Other current assets ($13,634, $13,350 and $10,765 related to CCJVs)		42,698		42,698
Total current assets		1,504,808		1,504,808
Property and equipment, net ($25,765, $31,136 and $27,752 related to CCJVs)		542,796		542,796
Long-term marketable securities		10,000		10,000
Investments in affiliates		84,914		84,914
Goodwill		264,112		264,112
Right of use assets		70,472		70,472
Deferred income taxes, net		38,443		38,443
Other noncurrent assets		118,228		118,228
Total assets		2,633,773		2,633,773
Current maturities of long-term debt		8,263		8,263
Accounts payable ($50,503, $57,795 and $50,625 related to CCJVs)		399,528		399,528
Contract liabilities ($73,426, $20,994 and $16,951 related to CCJVs)		106,010		106,010
Accrued expenses and other current liabilities ($4,553, $2,415 and $4,477 related to CCJVs)		342,040		342,040
Total current liabilities		855,841		855,841
Long-term debt		394,841		394,841
Long-term lease liabilities		56,740		56,740
Deferred income taxes, net		4,652		4,652
Other long-term liabilities		58,433		58,433
Commitments and contingencies (Note 18)
Preferred stock, $0.01 par value, authorized 3,000,000 shares, none outstanding		0		0
Common stock, $0.01 par value, authorized 150,000,000 shares; issued and outstanding: 45,655,682 shares as of September 30, 2020, 45,503,805 shares as of December 31, 2019 and 46,741,263 shares as of September 30, 2019		468		468
Additional paid-in capital		567,033		567,033
Accumulated other comprehensive loss		(3,282)		(3,282)
Retained earnings		656,487		656,487
Total Granite Construction Incorporated shareholders’ equity		1,220,706		1,220,706
Non-controlling interests		42,560		42,560
Total equity		1,263,266		1,263,266
Total liabilities and equity		2,633,773		2,633,773
Total revenue		1,088,110		2,497,451
Total cost of revenue		996,678		2,417,945
Gross profit		91,432		79,506
Selling, general and administrative expenses		73,424		224,577
Acquisition and integration expenses		2,744		15,244
Gain on sales of property and equipment		(7,101)		(13,936)
Operating income (loss)		22,365		(146,379)
Interest income		(1,713)		(6,257)
Interest expense		4,839		13,011
Equity in income of affiliates, net		(6,275)		(10,159)
Other (income) expense, net		127		(2,394)
Total other income		(3,022)		(5,799)
Income (loss) before provision for (benefit from) income taxes		25,387		(140,580)
Provision for (benefit from) income taxes		3,474		(37,451)
Net income (loss)		21,913		(103,129)
Amount attributable to non-controlling interests		(1,425)		(8,793)
Net income (loss) attributable to Granite Construction Incorporated		$ 20,488		$ (111,922)
Basic (in dollars per share)		$ 0.44		$ (2.39)
Diluted (in dollars per share)		$ 0.43		$ (2.39)
Basic (in shares)		46,788		46,771
Diluted (in shares)		47,170		46,771
Net (loss) income				$ (103,129)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization				92,700
Gain on sales of property and equipment, net				(13,936)
Deferred income taxes				(37,338)
Stock-based compensation				8,924
Equity in net loss from unconsolidated joint ventures				173,008
Net income from affiliates				(10,159)
Other non-cash adjustments				4,630
Changes in assets and liabilities, net of the effect of an acquisition in 2019:
Receivables				(224,475)
Contract assets, net				(13,276)
Inventories				(6,178)
Contributions to unconsolidated construction joint ventures				(57,280)
Distributions from unconsolidated construction joint ventures and affiliates				13,181
Other assets, net				(1,141)
Accounts payable				148,739
Accrued expenses and other current liabilities, net				(768)
Net cash used in operating activities				(26,498)
Previously Reported [Member] | Transportation [Member]
Total revenue		$ 598,646		1,340,834
Total cost of revenue		585,013		1,405,830
Previously Reported [Member] | Water [Member]
Total revenue		135,908		347,994
Total cost of revenue		120,878		313,582
Previously Reported [Member] | Specialty [Member]
Total revenue		224,457		540,234
Total cost of revenue		186,158		464,858
Previously Reported [Member] | Materials [Member]
Total revenue		129,099		268,389
Total cost of revenue		104,629		233,675
Revision of Prior Period, Adjustment [Member]
Cash and cash equivalents		0		0
Short-term marketable securities		0		0
Receivables, net ($32,028, $29,564 and $30,336 related to CCJVs)		10,569		10,569
Contract assets ($27,528, $25,034 and $24,481 related to CCJVs)		(17,452)		(17,452)
Inventories		0		0
Equity in construction joint ventures		(10,351)		(10,351)
Other current assets ($13,634, $13,350 and $10,765 related to CCJVs)		9,019		9,019
Total current assets		(8,215)		(8,215)
Property and equipment, net ($25,765, $31,136 and $27,752 related to CCJVs)		0		0
Long-term marketable securities		0		0
Investments in affiliates		0		0
Goodwill		0		0
Right of use assets		0		0
Deferred income taxes, net		(8,580)		(8,580)
Other noncurrent assets		0		0
Total assets		(16,795)		(16,795)
Current maturities of long-term debt		0		0
Accounts payable ($50,503, $57,795 and $50,625 related to CCJVs)		0		0
Contract liabilities ($73,426, $20,994 and $16,951 related to CCJVs)		9,025		9,025
Accrued expenses and other current liabilities ($4,553, $2,415 and $4,477 related to CCJVs)		12,031		12,031
Total current liabilities		21,056		21,056
Long-term debt		0		0
Long-term lease liabilities		0		0
Deferred income taxes, net		0		0
Other long-term liabilities		0		0
Commitments and contingencies (Note 18)
Preferred stock, $0.01 par value, authorized 3,000,000 shares, none outstanding		0		0
Common stock, $0.01 par value, authorized 150,000,000 shares; issued and outstanding: 45,655,682 shares as of September 30, 2020, 45,503,805 shares as of December 31, 2019 and 46,741,263 shares as of September 30, 2019		0		0
Additional paid-in capital		0		0
Accumulated other comprehensive loss		0		0
Retained earnings		(34,046)		(34,046)
Total Granite Construction Incorporated shareholders’ equity		(34,046)		(34,046)
Non-controlling interests		(3,805)		(3,805)
Total equity		(37,851)		(37,851)
Total liabilities and equity		(16,795)		(16,795)
Total revenue		22,090		69,425
Total cost of revenue		(7,571)		(23,973)
Gross profit		29,661		93,398
Selling, general and administrative expenses		0		0
Acquisition and integration expenses		0		0
Gain on sales of property and equipment		0		0
Operating income (loss)		29,661		93,398
Interest income		0		0
Interest expense		0		0
Equity in income of affiliates, net		0		0
Other (income) expense, net		0		0
Total other income		0		0
Income (loss) before provision for (benefit from) income taxes		29,661		93,398
Provision for (benefit from) income taxes		7,898		26,145
Net income (loss)		21,763		67,253
Amount attributable to non-controlling interests		2,660		4,060
Net income (loss) attributable to Granite Construction Incorporated		$ 24,423		$ 71,313
Basic (in dollars per share)		$ 0.52		$ 1.52
Diluted (in dollars per share)		$ 0.52		$ 1.52
Basic (in shares)		46,788		46,771
Diluted (in shares)		47,170		46,771
Net (loss) income				$ 67,253
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization				0
Gain on sales of property and equipment, net				0
Deferred income taxes				35,188
Stock-based compensation				0
Equity in net loss from unconsolidated joint ventures				(77,334)
Net income from affiliates				0
Other non-cash adjustments				0
Changes in assets and liabilities, net of the effect of an acquisition in 2019:
Receivables				0
Contract assets, net				(16,109)
Inventories				0
Contributions to unconsolidated construction joint ventures				0
Distributions from unconsolidated construction joint ventures and affiliates				0
Other assets, net				(8,998)
Accounts payable				0
Accrued expenses and other current liabilities, net				0
Net cash used in operating activities				0
Revision of Prior Period, Adjustment [Member] | Transportation [Member]
Total revenue		$ 23,861		72,094
Total cost of revenue				(24,647)
Revision of Prior Period, Adjustment [Member] | Transportation [Member] | Accounting Standards Update 2016-02 [Member]
Total cost of revenue		(8,245)
Revision of Prior Period, Adjustment [Member] | Water [Member]
Total revenue		(1,771)		(2,669)
Total cost of revenue		674		674
Revision of Prior Period, Adjustment [Member] | Specialty [Member]
Total revenue		0		0
Total cost of revenue		0		0
Revision of Prior Period, Adjustment [Member] | Materials [Member]
Total revenue		0		0
Total cost of revenue		0		0
Other Adjustments [Member]
Cash and cash equivalents		0		0
Short-term marketable securities		0		0
Receivables, net ($32,028, $29,564 and $30,336 related to CCJVs)		2,016		2,016
Contract assets ($27,528, $25,034 and $24,481 related to CCJVs)		(10,066)		(10,066)
Inventories		0		0
Equity in construction joint ventures		4,540		4,540
Other current assets ($13,634, $13,350 and $10,765 related to CCJVs)		208		208
Total current assets		(3,302)		(3,302)
Property and equipment, net ($25,765, $31,136 and $27,752 related to CCJVs)		0		0
Long-term marketable securities		0		0
Investments in affiliates		0		0
Goodwill		0		0
Right of use assets		0		0
Deferred income taxes, net		774		774
Other noncurrent assets		(1,790)		(1,790)
Total assets		(4,318)		(4,318)
Current maturities of long-term debt		0		0
Accounts payable ($50,503, $57,795 and $50,625 related to CCJVs)		215		215
Contract liabilities ($73,426, $20,994 and $16,951 related to CCJVs)		(5,736)		(5,736)
Accrued expenses and other current liabilities ($4,553, $2,415 and $4,477 related to CCJVs)		5,150		5,150
Total current liabilities		(371)		(371)
Long-term debt		0		0
Long-term lease liabilities		0		0
Deferred income taxes, net		0		0
Other long-term liabilities		0		0
Commitments and contingencies (Note 18)
Preferred stock, $0.01 par value, authorized 3,000,000 shares, none outstanding		0		0
Common stock, $0.01 par value, authorized 150,000,000 shares; issued and outstanding: 45,655,682 shares as of September 30, 2020, 45,503,805 shares as of December 31, 2019 and 46,741,263 shares as of September 30, 2019		0		0
Additional paid-in capital		0		0
Accumulated other comprehensive loss		0		0
Retained earnings		(2,751)		(2,751)
Total Granite Construction Incorporated shareholders’ equity		(2,751)		(2,751)
Non-controlling interests		(1,196)		(1,196)
Total equity		(3,947)		(3,947)
Total liabilities and equity		(4,318)		(4,318)
Total revenue		1,914		(6,857)
Total cost of revenue		449		(4,407)
Gross profit		1,465		(2,450)
Selling, general and administrative expenses		0		0
Acquisition and integration expenses		0		(1,475)
Gain on sales of property and equipment		0		0
Operating income (loss)		1,465		(975)
Interest income		0		0
Interest expense		0		0
Equity in income of affiliates, net		0		0
Other (income) expense, net		0		0
Total other income		0		0
Income (loss) before provision for (benefit from) income taxes		1,465		(975)
Provision for (benefit from) income taxes		375		(210)
Net income (loss)		1,090		(765)
Amount attributable to non-controlling interests		(100)		563
Net income (loss) attributable to Granite Construction Incorporated		$ 990		$ (202)
Basic (in dollars per share)		$ 0.02		$ (0.00)
Diluted (in dollars per share)		$ 0.02		$ (0.00)
Basic (in shares)		46,788		46,771
Diluted (in shares)		47,170		46,771
Net (loss) income				$ (765)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation, depletion and amortization				0
Gain on sales of property and equipment, net				0
Deferred income taxes				0
Stock-based compensation				0
Equity in net loss from unconsolidated joint ventures				(2,400)
Net income from affiliates				0
Other non-cash adjustments				0
Changes in assets and liabilities, net of the effect of an acquisition in 2019:
Receivables				(1,083)
Contract assets, net				7,846
Inventories				0
Contributions to unconsolidated construction joint ventures				0
Distributions from unconsolidated construction joint ventures and affiliates				0
Other assets, net				(251)
Accounts payable				(5,061)
Accrued expenses and other current liabilities, net				1,714
Net cash used in operating activities				0
Other Adjustments [Member] | Transportation [Member]
Total revenue		$ 1,360		(5,351)
Total cost of revenue		234		(4,622)
Other Adjustments [Member] | Water [Member]
Total revenue		267		231
Total cost of revenue		215		215
Other Adjustments [Member] | Specialty [Member]
Total revenue		287		(1,737)
Total cost of revenue		0		0
Other Adjustments [Member] | Materials [Member]
Total revenue		0		0
Total cost of revenue		$ 0		$ 0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(a))
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