Available-for-Sale-Securities Schedule of Available-for-sale Securites Reconciliation (Details) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 28,320,500	$ 22,358,200
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	3,700	1,300
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	(1,800)	0
Certificates of Deposit, at Carrying Value	28,322,400	22,359,500
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	0	249,000
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	0
Certificates of Deposit, at Carrying Value	0	249,000
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,065,000	0
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	(1,800)	0
Certificates of Deposit, at Carrying Value	1,063,200	0
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	11,635,000	12,791,900
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	0
Certificates of Deposit, at Carrying Value	11,635,000	12,791,900
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	15,620,500	9,317,300
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	3,700	1,300
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	0	0
Certificates of Deposit, at Carrying Value	$ 15,624,200	$ 9,318,600