ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Changes Of Accumulated Other Comprehensive Income [Line Items]
Total, beginning balance	$ 47,752,375	[1]
Other comprehensive income before reclassifications	6,868,379	[1]
Amounts reclassified from accumulated other comprehensive income	(1,383,591)	[1]
Other comprehensive income	5,484,788	[1]	6,659,927
Total, ending balance	53,237,163	[1]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains	2,667,873		8,918,329
Current Income Tax Expense (Benefit), Total	5,495,923		7,614,802
Total reclassification adjustment	1,383,591	[2]
Unrealized Gains and (Losses) on Available-for-sale securities
Changes Of Accumulated Other Comprehensive Income [Line Items]
Total, beginning balance	69,805,305	[1]
Other comprehensive income before reclassifications	6,868,379	[1]
Amounts reclassified from accumulated other comprehensive income	(1,734,118)	[1]
Other comprehensive income	5,134,261	[1]
Total, ending balance	74,939,566	[1]
Unrealized Gains and (Losses) on Available-for-sale securities | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Realized investment gains	2,667,873	[2]
Current Income Tax Expense (Benefit), Total	(933,755)	[2]
Total reclassification adjustment	1,734,118	[2]
Unrecognized pension and postretirement benefit obligations
Changes Of Accumulated Other Comprehensive Income [Line Items]
Total, beginning balance	(22,052,930)	[1]
Other comprehensive income before reclassifications	0	[1]
Amounts reclassified from accumulated other comprehensive income	350,527	[1]
Other comprehensive income	350,527	[1]
Total, ending balance	(21,702,403)	[1]
Unrecognized pension and postretirement benefit obligations | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Current Income Tax Expense (Benefit), Total	188,746	[2]
Net actuarial loss	(716,318)	[2],[3]
Prior service credit	177,045	[2],[3]
Total before tax	(539,273)	[2]
Total reclassification adjustment	$ (350,527)	[2]

[1] All amounts are net of tax. Amounts in parentheses indicate debits.

[2] Amounts in parentheses indicate debits to net income

[3] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement benefit costs (see Note 6, Employee Retirement Plans, for additional details).