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Business Segments (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
segment
Mar. 31, 2016
USD ($)
Business segments    
Number of business segments | segment 2  
Revenues $ 36,153 $ 33,586
Depreciation, depletion and amortization 4,236 3,909
Gross profit (loss) 8,238 7,848
Capital expenditures 4,208 3,935
Lime and limestone operations    
Business segments    
Revenues 35,517 33,154
Depreciation, depletion and amortization 4,031 3,714
Gross profit (loss) 8,020 7,929
Capital expenditures 4,206 3,931
Natural gas interests    
Business segments    
Revenues 636 432
Depreciation, depletion and amortization 205 195
Gross profit (loss) 218 (81)
Capital expenditures $ 2 $ 4