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Available-for-Sale-Securities Schedule of Available-for-sale Securites Reconciliation (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 1,409,000 $ 6,874,800
Deferred Tax Liabilities, Unrealized Gains on Trading Securities 0 800
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 0
Certificates of Deposit, at Carrying Value 1,409,000 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 1,409,000 837,700
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 1,409,000 837,700
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 0 4,740,900
Deferred Tax Liabilities, Unrealized Gains on Trading Securities 0 800
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 0 0
Certificates of Deposit, at Carrying Value $ 0 $ 4,741,700