Fair Values Of Assets And Liabilities (Schedule Of Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Sep. 07, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repurchase agreement	$ 100	$ 100
Money market		2,829,397
Marketable securities	10,254,243	10,158,016	10,000,000
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repurchase agreement	0	0
Money market		2,829,397
Marketable securities	10,254,243	10,158,016
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repurchase agreement	100	100
Money market		0
Marketable securities	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Repurchase agreement	0	0
Money market		0
Marketable securities	$ 0	$ 0