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Note 7 - Unearned Revenue - Schedule of Unearned Revenue (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019
Unearned Revenue	$ 3,535,639	$ 3,600,028	$ 3,751,483
Water and Mineral Services [Member]
Unearned Revenue	130,561	143,539	224,720
California 1[Member]
Unearned Revenue	820,525	674,113	724,175
Federal [Member]
Unearned Revenue	140,494	150,678	147,946
Heavy Civil [Member]
Unearned Revenue	1,456,617	1,603,014	1,820,161
Midwest [Member]
Unearned Revenue	326,314	349,483	366,212
Northwest [Member]
Unearned Revenue	661,128	679,201	468,269
Transportation [Member]
Unearned Revenue	2,626,520	2,691,091	2,975,535
Transportation [Member] | Water and Mineral Services [Member]
Unearned Revenue	0	0	0
Transportation [Member] | California 1[Member]
Unearned Revenue	636,385	527,971	590,641
Transportation [Member] | Federal [Member]
Unearned Revenue	16,464	18,152	80
Transportation [Member] | Heavy Civil [Member]
Unearned Revenue	1,188,587	1,321,443	1,805,917
Transportation [Member] | Midwest [Member]
Unearned Revenue	214,016	208,872	204,749
Transportation [Member] | Northwest [Member]
Unearned Revenue	571,068	614,653	374,148
Water [Member]
Unearned Revenue	227,864	241,161	255,516
Water [Member] | Water and Mineral Services [Member]
Unearned Revenue	130,561	143,539	224,720
Water [Member] | California 1[Member]
Unearned Revenue	61,151	52,136	14,382
Water [Member] | Federal [Member]
Unearned Revenue	861	957	1,350
Water [Member] | Heavy Civil [Member]
Unearned Revenue	34,961	41,511	14,244
Water [Member] | Midwest [Member]
Unearned Revenue	0	150	110
Water [Member] | Northwest [Member]
Unearned Revenue	330	2,868	710
Specialty [Member]
Unearned Revenue	681,255	667,776	520,432
Specialty [Member] | Water and Mineral Services [Member]
Unearned Revenue	0	0	0
Specialty [Member] | California 1[Member]
Unearned Revenue	122,989	94,006	119,152
Specialty [Member] | Federal [Member]
Unearned Revenue	123,169	131,569	146,516
Specialty [Member] | Heavy Civil [Member]
Unearned Revenue	233,069	240,060	0
Specialty [Member] | Midwest [Member]
Unearned Revenue	112,298	140,461	161,353
Specialty [Member] | Northwest [Member]
Unearned Revenue	$ 89,730	$ 61,680	$ 93,411

X

- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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