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Investments (Details Textual) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 22,869,924	$ 28,762,231
Held-to-maturity Securities [Member]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	22,869,924
Current Investments [Member]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	18,949,924	21,556,857
2019 Maturity Investments [Member] | Held-to-maturity Securities [Member]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	8,770,000
Long Term Investments [Member]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	3,920,000	$ 7,205,374
2018 Maturity Investments [Member] | Held-to-maturity Securities [Member]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	$ 14,100,000

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- Definition

Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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