Note 6 - Unearned Revenue (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule Of Unearned Revenue [Table Text Block]

December 31, 2019	Transportation		Water		Specialty		Total
California	$	525,641	$	19,950	$	100,019	$	645,610
Federal		14,139		1,041		153,563		168,743
Heavy Civil		1,480,367		47,046		243,329		1,770,742
Midwest		230,889		152		135,680		366,721
Northwest		547,020		4,545		61,706		613,271
Water and Mineral Services		—		152,141		—		152,141
Total	$	2,798,056	$	224,875	$	694,297	$	3,717,228

December 31, 2018 (As Restated)	Transportation		Water		Specialty		Total
California	$	313,099	$	6,163	$	62,998	$	382,260
Federal		134		2,195		125,444		127,773
Heavy Civil		1,549,545		20,956		—		1,570,501
Midwest		78,042		211		205,203		283,456
Northwest		339,285		786		81,951		422,022
Water and Mineral Services		—		189,597		—		189,597
Total	$	2,280,105	$	219,908	$	475,596	$	2,975,609