Lines Of Business (Summary Of Business Segment) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Sales to unaffiliated customers	$ 37,954,290	$ 36,993,658	$ 60,744,506	$ 63,127,595
Intersegment sales	0	0	0	0
Total net sales	37,954,290	36,993,658	60,744,506	63,127,595
Income (loss) from operations	3,736,110	4,883,985	(653,375)	2,491,472
Other income, net	1,464,755	61,985	5,282,006	458,876
Income before income taxes	5,200,865	4,945,970	4,628,631	2,950,348
Capital Expenditures	2,982,190	1,181,685	10,099,290	2,644,700
Identifiable Assets	142,757,587		142,757,587		133,827,397
Total Assets	187,311,512		187,311,512		181,288,145
Cement Business [Member]
Segment Reporting Information [Line Items]
Sales to unaffiliated customers	16,141,303	13,807,451	24,585,967	23,011,373
Intersegment sales	5,330,802	5,390,409	9,157,301	9,169,438
Total net sales	21,472,105	19,197,860	33,743,268	32,180,811
Income (loss) from operations	3,140,627	3,737,649	423,057	2,286,646
Capital Expenditures	1,580,272	1,034,587	6,247,496	1,689,646
Identifiable Assets	94,486,078		94,486,078		88,491,938
Ready-Mixed Concrete Business [Member]
Segment Reporting Information [Line Items]
Sales to unaffiliated customers	21,812,987	23,186,207	36,158,539	40,116,222
Intersegment sales	0	0	0	0
Total net sales	21,812,987	23,186,207	36,158,539	40,116,222
Income (loss) from operations	595,483	1,146,336	(1,076,432)	204,826
Capital Expenditures	1,401,918	147,098	3,851,794	955,054
Identifiable Assets	48,271,509		48,271,509		45,335,459
Adjustments and Elimination [Member]
Segment Reporting Information [Line Items]
Sales to unaffiliated customers	0	0	0	0
Intersegment sales	(5,330,802)	(5,390,409)	(9,157,301)	(9,169,438)
Total net sales	(5,330,802)	(5,390,409)	(9,157,301)	(9,169,438)
Corporate [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 44,553,925		$ 44,553,925		$ 47,460,748