Available-for-Sale-Securities Schedule of Available-for-sale Securites Reconciliation (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	$ 4,391,900	$ 6,874,800
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	0	800
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	(500)	0
Certificates of Deposit, at Carrying Value	4,391,400	6,875,600
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	0	1,047,200
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	1,047,200
Money Market Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,562,900	837,700
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	2,562,900	837,700
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,829,000	4,740,900
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	0	800
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	(500)	0
Certificates of Deposit, at Carrying Value	$ 1,828,500	$ 4,741,700