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Available-for-Sale-Securities Schedule of Available-for-sale Securites Reconciliation (Details) - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 18,423,300 $ 22,358,200
Deferred Tax Liabilities, Unrealized Gains on Trading Securities 1,500 1,300
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (600) 0
Certificates of Deposit, at Carrying Value 18,424,200 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 1,729,400 0
Deferred Tax Liabilities, Unrealized Gains on Trading Securities 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value (600) 0
Certificates of Deposit, at Carrying Value 1,728,800 0
Money Market Funds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 12,408,600 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 12,408,600 12,791,900
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 4,285,300 9,317,300
Deferred Tax Liabilities, Unrealized Gains on Trading Securities 1,500 1,300
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 0
Certificates of Deposit, at Carrying Value $ 4,286,800 $ 9,318,600