Marketable Securities (Schedule Of Cost And Fair Value By Contractual Maturity) (Details) (USD $)	Mar. 31, 2015
Marketable Securities [Abstract]
Less than 1 year, Cost Basis, Maturity	$ 13,499,679
Less than 1 year, Fair Value, Maturity	13,499,823
1 to 5 years, Cost Basis, Maturity	5,155,066
1 to 5 years, Fair Value, Maturity	5,155,998
Total Marketable Securities, Cost Basis, Maturity	18,654,745
Total Marketable Securities, Fair Value, Maturity	$ 18,655,821