Reportable Segment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Business segments
Number of business segments | segment	1
Revenues	$ 189,255	$ 160,704	$ 158,277
Depreciation, depletion and amortization	20,630	19,379	17,394
Gross profit (loss)	59,260	47,587	41,676
Operating profit	46,417	33,869	29,246
Assets	316,196	279,098	247,037
Capital expenditures	29,914	17,133	27,100
Impairment of long-lived assets		1,550	930
Unallocated corporate assets and cash items
Business segments
Assets	111,381	88,152	61,380
Lime and Limestone Operations Segment Member
Business segments
Depreciation, depletion and amortization	20,052	18,664	16,432
Gross profit (loss)	58,651	47,983	42,043
Operating profit	45,835	35,815	30,543
Assets	204,815	190,946	185,657
Capital expenditures	29,914	17,133	27,100
Other
Business segments
Depreciation, depletion and amortization	578	715	962
Gross profit (loss)	609	(396)	(367)
Operating profit	582	(1,946)	(1,297)
Lime and limestone operations | Lime and Limestone Operations Segment Member
Business segments
Revenues	187,365	159,707	156,981
Others | Other
Business segments
Revenues	$ 1,890	$ 997	$ 1,296