Reportable Segment (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business segments
Number of business segments | segment	1
Revenues	$ 281,330,000	$ 236,150,000	$ 189,255,000
Depreciation, depletion and amortization	23,533,000	21,921,000	20,630,000
Gross profit (loss)	102,867,000	70,342,000	59,260,000
Operating profit (loss)	85,422,000	54,783,000	46,417,000
Assets	440,602,000	367,772,000	316,196,000
Capital expenditures	34,250,000	26,815,000	29,914,000
Impairment of long-lived assets	0	0
Unallocated corporate assets and cash items
Business segments
Depreciation, depletion and amortization	553,000	553,000	578,000
Gross profit (loss)	(38,000)	1,391,000	609,000
Operating profit (loss)	(52,000)	1,379,000	582,000
Assets	193,454,000	138,788,000	111,381,000
Lime and Limestone Operations Segment Member | Operating Segment
Business segments
Depreciation, depletion and amortization	22,980,000	21,368,000	20,052,000
Gross profit (loss)	102,905,000	68,951,000	58,651,000
Operating profit (loss)	85,474,000	53,404,000	45,835,000
Assets	247,148,000	228,984,000	204,815,000
Capital expenditures	34,250,000	26,815,000	29,914,000
Lime and limestone operations | Lime and Limestone Operations Segment Member | Operating Segment
Business segments
Revenues	280,202,000	233,421,000	187,365,000
Others | Unallocated corporate assets and cash items
Business segments
Revenues	$ 1,128,000	$ 2,729,000	$ 1,890,000