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Note 7 - Unearned Revenue - Schedule of Unearned Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Unearned Revenue	$ 3,114,354	$ 3,535,639	$ 3,632,096
Water and Mineral Services [Member]
Unearned Revenue	118,938	130,561	159,608
California 1[Member]
Unearned Revenue	731,334	820,525	637,164
Federal [Member]
Unearned Revenue	121,554	140,494	193,566
Heavy Civil [Member]
Unearned Revenue	1,309,264	1,456,616	1,925,993
Midwest [Member]
Unearned Revenue	276,232	326,315	362,836
Northwest [Member]
Unearned Revenue	557,032	661,128	352,929
Transportation [Member]
Unearned Revenue	2,311,906	2,626,520	2,661,179
Transportation [Member] | Water and Mineral Services [Member]
Unearned Revenue	0	0	0
Transportation [Member] | California 1[Member]
Unearned Revenue	562,988	636,385	520,649
Transportation [Member] | Federal [Member]
Unearned Revenue	13,787	16,464	14,699
Transportation [Member] | Heavy Civil [Member]
Unearned Revenue	1,060,034	1,188,587	1,627,696
Transportation [Member] | Midwest [Member]
Unearned Revenue	169,538	214,016	222,045
Transportation [Member] | Northwest [Member]
Unearned Revenue	505,559	571,068	276,090
Water [Member]
Unearned Revenue	197,554	227,864	235,153
Water [Member] | Water and Mineral Services [Member]
Unearned Revenue	118,938	130,561	159,608
Water [Member] | California 1[Member]
Unearned Revenue	52,598	61,151	19,594
Water [Member] | Federal [Member]
Unearned Revenue	494	861	1,181
Water [Member] | Heavy Civil [Member]
Unearned Revenue	24,803	34,961	52,820
Water [Member] | Midwest [Member]
Unearned Revenue	0	0	70
Water [Member] | Northwest [Member]
Unearned Revenue	721	330	1,880
Specialty [Member]
Unearned Revenue	604,894	681,255	735,764
Specialty [Member] | Water and Mineral Services [Member]
Unearned Revenue	0	0	0
Specialty [Member] | California 1[Member]
Unearned Revenue	115,748	122,989	96,921
Specialty [Member] | Federal [Member]
Unearned Revenue	107,273	123,169	177,686
Specialty [Member] | Heavy Civil [Member]
Unearned Revenue	224,427	233,068	245,477
Specialty [Member] | Midwest [Member]
Unearned Revenue	106,694	112,299	140,721
Specialty [Member] | Northwest [Member]
Unearned Revenue	$ 50,752	$ 89,730	$ 74,959

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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