Note 5 - Unearned Revenue (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule Of Unearned Revenue [Table Text Block]

December 31, 2020	Transportation		Water		Specialty		Total
California	$	618,429	$	38,716	$	141,786	$	798,931
Federal		11,895		227		77,886		90,008
Heavy Civil		913,430		14,605		216,487		1,144,522
Midwest		138,246		—		90,221		228,467
Northwest		487,682		2,462		58,756		548,900
Water and Mineral Services		—		119,124		—		119,124
Total	$	2,169,682	$	175,134	$	585,136	$	2,929,952

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