Reportable Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Business segments
Number of business segments | segment	1
Revenues	$ 50,909	$ 41,674
Depreciation, depletion and amortization	5,183	5,276
Gross profit	14,467	11,805
Operating profit	10,832	8,738
Identifiable assets, at period end	324,747	285,410	$ 316,196
Capital expenditures	5,517	4,543
Lime and Limestone Operations Segment Member
Business segments
Depreciation, depletion and amortization	5,039	5,137
Gross profit	14,197	11,804
Operating profit	10,562	8,737
Identifiable assets, at period end	218,522	191,419
Capital expenditures	5,517	4,543
Other
Business segments
Depreciation, depletion and amortization	144	139
Gross profit	270	1
Operating profit	270	1
Unallocated corporate assets and cash items
Business segments
Identifiable assets, at period end	106,225	93,991
Lime and limestone operations | Lime and Limestone Operations Segment Member
Business segments
Revenues	50,296	41,356
Others | Other
Business segments
Revenues	$ 613	$ 318