Note 12 - Intangible Assets - Summary of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Gross Value, Assets	$ 89,247	$ 97,946
Accumulated Amortization	(56,255)	(50,889)
Net Value, Assets	32,992	47,057
Gross Value, Liabilities	6,700	6,773
Accumulated Amortization, Liabilities	(6,655)	(6,339)
Net Value, Liabilities	45	434
Total net amortized intangible assets, gross value	82,547	91,173
Total net amortized intangible assets, accumulated amortization	(49,600)	(44,550)
Total net amortized intangible assets, net value	32,947	46,623
Customer Relationships [Member]
Gross Value, Assets	37,319	39,541
Accumulated Amortization	(21,415)	(16,944)
Net Value, Assets	15,904	22,597
Construction Permits [Member]
Gross Value, Assets	23,959	23,959
Accumulated Amortization	(13,474)	(12,484)
Net Value, Assets	10,485	11,475
Order or Production Backlog [Member]
Gross Value, Assets	8,400	10,201
Accumulated Amortization	(8,381)	(9,247)
Net Value, Assets	19	954
Developed Technology Rights [Member]
Gross Value, Assets	9,003	9,354
Accumulated Amortization	(5,869)	(3,752)
Net Value, Assets	3,134	5,602
Trademarks and Trade Names [Member]
Gross Value, Assets	8,400	8,993
Accumulated Amortization	(5,345)	(3,667)
Net Value, Assets	3,055	5,326
Favorable Contracts, Noncompete Covenants and Other [Member]
Gross Value, Assets	2,166	5,898
Accumulated Amortization	(1,771)	(4,795)
Net Value, Assets	395	1,103
Unfavorable Contracts and Leases [Member]
Gross Value, Liabilities	6,700	6,773
Accumulated Amortization, Liabilities	(6,655)	(6,339)
Net Value, Liabilities	$ 45	$ 434