INVESTMENT SECURITIES (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost, as adjusted	$ 48,682,484	$ 47,169,544
Gross unrealized holding gains	51,463	0
Gross unrealized holding losses	7,019	108,668
Estimated fair value	48,726,928	47,060,876
Obligations of domestic governmental agencies [Member] | Short-term Investments [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost, as adjusted	22,224,258	22,166,512
Gross unrealized holding gains	3,012	0
Gross unrealized holding losses	2,191	22,822
Estimated fair value	22,225,079	22,143,690
Obligations of domestic governmental agencies [Member] | Other Long-term Investments [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost, as adjusted	26,458,226	25,003,032
Gross unrealized holding gains	48,451	0
Gross unrealized holding losses	4,828	85,846
Estimated fair value	$ 26,501,849	$ 24,917,186