INVESTMENT SECURITIES (Tables)

12 Months Ended

Dec. 31, 2016

Investments, Debt and Equity Securities [Abstract]

Held-to-maturity Securities

	December 31, 2016
	Amortized cost, as adjusted		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
Short-term investments:
Obligations of domestic governmental agencies (maturing between February 2017 and September 2017) (held-to-maturity)	$	19,853,860	$	3,270	$	2,492	$	19,854,638
Total short-term investment securities	$	19,853,860	$	3,270	$	2,492	$	19,854,638

	December 31, 2015
	Amortized cost, as adjusted		Gross unrealized holding gains		Gross unrealized holding losses		Estimated fair value
Short-term investments:
Obligations of domestic governmental agencies (maturing between January 2016 and December 2016) (held-to-maturity)	$	$22,166,512	$	--	$	$22,822	$	$22,143,690
Long-term investments:
Obligations of domestic governmental agencies (maturing between January 2017 and December 2017) (held-to-maturity)		25,003,032		--		85,846		24,917,186
Total short-term and long-term investment securities	$	47,169,544	$	--	$	108,668	$	47,060,876