Reportable Segment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Business segments
Number of business segments | segment			1
Revenues	$ 60,492	$ 49,162	$ 111,401	$ 90,836
Depreciation, depletion and amortization	5,473	5,167	10,656	10,443
Gross profit	16,481	16,795	30,948	28,600
Operating profit	12,633	13,838	23,465	22,576
Identifiable assets, at period end	336,733	297,112	336,733	297,112	$ 316,196
Capital expenditures	5,968	13,233	11,485	17,776
Lime and Limestone Operations Segment Member
Business segments
Depreciation, depletion and amortization	5,330	5,020	10,369	10,157
Gross profit	15,975	16,682	30,172	28,506
Operating profit	12,127	13,725	22,689	22,482
Identifiable assets, at period end	223,101	202,179	223,101	202,179
Capital expenditures	5,968	13,233	11,485	17,776
Other
Business segments
Depreciation, depletion and amortization	143	147	287	286
Gross profit	506	113	776	94
Operating profit	506	113	776	94
Unallocated corporate assets and cash items
Business segments
Identifiable assets, at period end	113,632	94,933	113,632	94,933
Lime and limestone operations | Lime and Limestone Operations Segment Member
Business segments
Revenues	59,613	48,742	109,909	90,098
Others | Other
Business segments
Revenues	$ 879	$ 420	$ 1,492	$ 738