Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Marketable Securities - Schedule of Marketable Securities (Details)

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Fair Value Measurement - Marketable Securities - Schedule of Marketable Securities (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Cost $ 8,680,456 $ 5,010,165
Accrued Income 15,397 1,442
Unrealized Gains
Unrealized Losses (16,843)
Fair Value 8,679,010 5,011,607
Fair Value, Inputs, Level 2 [Member]    
Debt Securities, Available-for-sale [Line Items]    
Cost 8,680,456 5,010,165
Accrued Income 15,397 1,442
Unrealized Gains
Unrealized Losses (16,843)
Fair Value 8,679,010 5,011,607
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]    
Debt Securities, Available-for-sale [Line Items]    
Cost 26 5,165
Accrued Income 5 161
Unrealized Gains
Unrealized Losses
Fair Value 31 5,326
Fair Value, Inputs, Level 2 [Member] | Municipal Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Cost 8,680,430 5,005,000
Accrued Income 15,392 1,281
Unrealized Gains
Unrealized Losses (16,843)
Fair Value $ 8,678,979 $ 5,006,281