Federal Income Taxes (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation for cash dividends paid with dividends paid deduction
Cash dividends paid	$ 21,120,059	$ 16,798,495	$ 11,921,695
Less: Portion designated as capital gains distributions	(3,460,000)	(4,146,773)	(1,750,781)
Less: Return of capital	(10,044,726)	(7,013,384)	(6,213,201)
Dividends paid deduction	$ 7,615,333	$ 5,638,338	$ 3,957,713