Investment Securities - Summary of Available for Sale Securities (Detail) - USD ($)		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Level 1 and 2 Inputs)		$ 4,901,267
Cost			$ 6,825,415
Losses in Accumulated Other Comprehensive Income			(1,121,648)
Estimated Fair Value(Level 1 and 2 Inputs)		5,703,767	5,703,767	$ 0
Estimated Fair Value(Level 1 and 2 Inputs)		$ 802,500
Quoted Prices in Active Markets (Level 1 and 2 Inputs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value(Level 1 and 2 Inputs)			5,703,767
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Cost	[1]		5,981,464
Losses in Accumulated Other Comprehensive Income			(1,080,197)
Equity Securities | Quoted Prices in Active Markets (Level 1 and 2 Inputs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Level 1 and 2 Inputs)			4,901,267
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Cost			843,951
Losses in Accumulated Other Comprehensive Income			(41,451)
Debt Securities | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost			843,951
Losses in Accumulated Other Comprehensive Income			(41,451)
Debt Securities | Quoted Prices in Active Markets (Level 1 and 2 Inputs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value(Level 1 and 2 Inputs)			802,500
Debt Securities | Quoted Prices in Active Markets (Level 1 and 2 Inputs) [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value(Level 1 and 2 Inputs)			802,500
Common Stock [Member] | Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Cost	[1]		5,981,464
Losses in Accumulated Other Comprehensive Income			(1,080,197)
Common Stock [Member] | Equity Securities | Quoted Prices in Active Markets (Level 1 and 2 Inputs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Level 1 and 2 Inputs)			$ 4,901,267

[1] (1) The cost basis in the common stock investment is net of an other-than-temporary impairment charge of approximately $60,000 charged to earnings through investment income in the consolidated statements of operations.