Note 19 - Reportable Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Total revenue	$ 547,586	$ 566,332
Total gross profit from continuing operations	49,775	53,712
Depreciation, depletion and amortization	14,127	11,955
Segment assets	2,282,141	2,373,684	$ 2,494,927
Constructions [Member]
Total revenue	474,935	506,971
Total gross profit from continuing operations	48,192	52,769
Depreciation, depletion and amortization	7,794	6,618
Materials [Member]
Total revenue	72,651	59,361
Total gross profit from continuing operations	1,583	943
Depreciation, depletion and amortization	6,333	5,337
Operating Segments [Member]
Total revenue	564,489	577,423
Segment assets	717,449	690,709
Operating Segments [Member] | Constructions [Member]
Total revenue	474,935	506,971
Segment assets	363,029	360,894
Operating Segments [Member] | Materials [Member]
Total revenue	89,554	70,452
Segment assets	354,420	329,815
Consolidation, Eliminations [Member]
Total revenue	(16,903)	(11,091)
Consolidation, Eliminations [Member] | Constructions [Member]
Total revenue	0	0
Consolidation, Eliminations [Member] | Materials [Member]
Total revenue	$ (16,903)	$ (11,091)