Distributions (Tables)

12 Months Ended

Dec. 31, 2013

Distributions [Abstract]

Summary of payment of distributions to shareholders

	2013				2012				2011
Quarter Ended	Amount		Per Share		Amount		Per Share		Amount		Per Share
March 31	$	3,155,607	$	0.18	$	2,809,868	$	0.18	$	2,523,564	$	0.18
June 30		3,294,938		0.18		2,902,806		0.18		2,595,832		0.18
September 30		3,456,304		0.18		2,954,616		0.18		2,652,386		0.18
December 31		3,656,622		0.18		3,062,506		0.18		2,723,255		0.18
	$	13,563,471	$	0.72	$	11,729,796	$	0.72	$	10,495,037	$	0.72

Summary of payment of dividends to preferred shareholders

Declaration Date	Record Date	Payment Date	Dividend		Dividend per Share
1/16/2013	2/15/2013	3/15/2013	$	1,889,147	$	0.515625
4/8/2013	5/15/2013	6/17/2013		1,889,147		0.515625
7/1/2013	8/15/2013	9/16/2013		1,889,147		0.515625
10/1/2013	11/15/2013	12/16/2013		1,889,147		0.515625
			$	7,556,588	$	2.0625

Declaration Date	Record Date	Payment Date	Dividend		Dividend per Share
1/18/2012	2/15/2012	3/15/2012	$	690,319	$	0.515625
4/17/2012	5/15/2012	6/15/2012		930,716		0.515625
7/9/2012	8/15/2012	9/17/2012		1,244,616		0.515625
10/1/2012	11/15/2012	12/17/2012		1,459,458		0.515625
			$	4,325,109	$	2.0625

Declaration Date	Record Date	Payment Date	Dividend		Dividend per Share
7/5/2011	8/15/2011	9/15/2011	$	736,341	$	0.550000
10/4/2011	11/15/2011	12/15/2011		690,318		0.515625
			$	1,426,659	$	1.065625