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Note 6 - Unearned Revenue | 9 Months Ended
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Sep. 30, 2021
Notes to Financial Statements |
Unearned Revenue From Unsatisfied Performance Obligations [Text Block] | 6. Unearned Revenue The following tables present our unearned revenue as of the respective periods (in thousands):
September 30, 2021 |  | Transportation |  |  | Water |  |  | Specialty |  |  | Total |
California |  | $ | 695,445 |  |  | $ | 35,972 |  |  | $ | 114,178 |  |  | $ | 845,595 |
Federal |  |  | 40,477 |  |  |  | 65 |  |  |  | 75,827 |  |  |  | 116,369 |
Heavy Civil |  |  | 513,590 |  |  |  | 154,005 |  |  |  | 124,026 |  |  |  | 791,621 |
Midwest |  |  | 85,755 |  |  |  | — |  |  |  | 287,144 |  |  |  | 372,899 |
Northwest |  |  | 468,397 |  |  |  | 3,731 |  |  |  | 273,622 |  |  |  | 745,750 |
Water and Mineral Services |  |  | — |  |  |  | 159,958 |  |  |  | — |  |  |  | 159,958 |
Total |  | $ | 1,803,664 |  |  | $ | 353,731 |  |  | $ | 874,797 |  |  | $ | 3,032,192 |
June 30, 2021 |  | Transportation |  |  | Water |  |  | Specialty |  |  | Total |
California |  | $ | 769,260 |  |  | $ | 44,066 |  |  | $ | 150,178 |  |  | $ | 963,504 |
Federal |  |  | 7,303 |  |  |  | 73 |  |  |  | 102,972 |  |  |  | 110,348 |
Heavy Civil |  |  | 622,491 |  |  |  | 161,632 |  |  |  | 172,818 |  |  |  | 956,941 |
Midwest |  |  | 107,630 |  |  |  | — |  |  |  | 295,447 |  |  |  | 403,077 |
Northwest |  |  | 568,814 |  |  |  | 3,891 |  |  |  | 292,395 |  |  |  | 865,100 |
Water and Mineral Services |  |  | — |  |  |  | 153,051 |  |  |  | — |  |  |  | 153,051 |
Total |  | $ | 2,075,498 |  |  | $ | 362,713 |  |  | $ | 1,013,810 |  |  | $ | 3,452,021 |
September 30, 2020 |  | Transportation |  |  | Water |  |  | Specialty |  |  | Total |
California |  | $ | 562,988 |  |  | $ | 52,598 |  |  | $ | 115,748 |  |  | $ | 731,334 |
Federal |  |  | 13,787 |  |  |  | 494 |  |  |  | 107,273 |  |  |  | 121,554 |
Heavy Civil |  |  | 1,060,034 |  |  |  | 24,803 |  |  |  | 224,427 |  |  |  | 1,309,264 |
Midwest |  |  | 169,538 |  |  |  | — |  |  |  | 106,694 |  |  |  | 276,232 |
Northwest |  |  | 505,559 |  |  |  | 721 |  |  |  | 50,752 |  |  |  | 557,032 |
Water and Mineral Services |  |  | — |  |  |  | 118,938 |  |  |  | — |  |  |  | 118,938 |
Total |  | $ | 2,311,906 |  |  | $ | 197,554 |  |  | $ | 604,894 |  |  | $ | 3,114,354 |
Approximately $2.3 billion of the September 30, 2021 unearned revenue is expected to be recognized within the next twelve months and the remaining amount will be recognized thereafter.

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