Note 2 - Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Aug. 05, 2019	Feb. 02, 2019	Dec. 31, 2018	Apr. 02, 2018
Goodwill	$ 3,423			$ 2,358
EZ-Dumper [Member]
Accounts receivable, net
Inventories		43
Property and equipment		67
Prepaid expenses and other
Goodwill		166
Intangible assets		23
Total assets acquired		299
Total liabilities assumed		(166)
Cash paid		$ 133
McCullough [Member]
Accounts receivable, net			$ 461
Inventories			586
Property and equipment			4,138
Prepaid expenses and other
Goodwill			898
Intangible assets			5,599
Total assets acquired			11,682
Total liabilities assumed			(682)
Cash paid			$ 11,000
Berlin Metals [Member]
Accounts receivable, net					$ 6,609
Inventories					14,769
Property and equipment					2,898
Prepaid expenses and other					345
Goodwill
Intangible assets					5,255
Total assets acquired					29,876
Total liabilities assumed					(7,969)
Cash paid					$ 21,907