Condensed Consolidated Balance Sheets (USD $)	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 725,599	$ 1,440,959
Receivables, less allowances of $661,000 in 2013 and $636,000 in 2012 for doubtful accounts	18,247,767	17,235,220
Inventories, priced at cost which is not in excess of market-
Finished cement	5,719,486	5,385,586
Work in process	3,021,710	3,040,112
Building products	4,569,437	4,324,133
Fuel, gypsum, paper sacks and other	7,591,610	6,760,554
Operating and maintenance supplies	13,166,174	13,244,419
Total inventories	34,068,417	32,754,804
Refundable federal and state income taxes	1,968,977	1,441,206
Deferred income taxes	750,000	750,000
Prepaid expenses	1,246,775	658,369
Total current assets	57,007,535	54,280,558
Property, Plant and Equipment, at cost, less accumulated depreciation and depletion of $194,545,371 in 2013 and $193,109,379 in 2012	87,915,366	83,179,004
Deferred Income Taxes	14,921,458	14,964,458
Investments, carried at fair value	24,307,498	24,761,746
Investments, carried at cost	2,618,904	2,618,904
Other Assets	1,439,481	1,483,475
Total Assets	188,210,242	181,288,145
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	8,347,899	11,186,677
Current portion of term loan	1,428,571	1,237,816
Current portion of other long-term debt	175,000	175,000
Accrued liabilities	5,675,883	7,141,353
Total current liabilities	15,627,353	19,740,846
Long-Term Debt	22,023,118	9,683,965
Accrued Postretirement Benefits	36,611,347	36,262,992
Accrued Pension Expense	13,356,051	13,241,529
STOCKHOLDERS' EQUITY:
Capital stock	6,495,812	6,490,117
Additional paid-in-capital	2,485,125	2,485,125
Retained earnings	95,275,157	97,214,376
Accumulated other comprehensive loss	(7,201,994)	(7,374,773)
Total stockholders' equity	100,592,373	102,358,813
Liabilities and Equity, Total	188,210,242	181,288,145
Class B Capital Stock [Member]
STOCKHOLDERS' EQUITY:
Capital stock	$ 3,538,273	$ 3,543,968