Investment Securities - Summary of Sale of Investment Securities and Gains (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Gain recognized in Statement of Operations on the Disposition of Securities	$ 154,914	$ 285,705
Debt Securities [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Proceeds from the Disposition of Securities	2,084,994	2,084,994
Cost Basis of Securities Sold	(1,930,080)	(1,930,080)
Gain recognized in Statement of Operations on the Disposition of Securities	$ 154,914	154,914
Equity Securities [Member]
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]
Proceeds from the Disposition of Securities		834,964
Cost Basis of Securities Sold		(704,173)
Gain recognized in Statement of Operations on the Disposition of Securities		$ 130,791