Fair Value Measurements (Schedule Of Unrealized Losses From Investments)(Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 101,200	$ 0
Less than 12 months, Unrealized Losses	1,595	0
12 months or greater, Fair Value	0	15,379
12 months or greater, Unrealized Losses	0	2,737
Total, Fair Value	101,200	15,379
Total, Unrealized Losses	1,595	2,737
Cement Industry [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value		0
Less than 12 months, Unrealized Losses		0
12 months or greater, Fair Value		15,379
12 months or greater, Unrealized Losses		2,737
Total, Fair Value		15,379
Total, Unrealized Losses		2,737
Residential Construction Industry [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	101,200
Less than 12 months, Unrealized Losses	1,595
12 months or greater, Fair Value	0
12 months or greater, Unrealized Losses	0
Total, Fair Value	101,200
Total, Unrealized Losses	$ 1,595