Distributions (Tables)

12 Months Ended

Dec. 31, 2014

Distributions [Abstract]

Summary of payment of distributions to shareholders

		2014			2013			2012
Quarter Ended	Amount		Per Share	Amount		Per Share	Amount		Per Share
March 31	$3,853,595		$0.18	$3,155,607		$0.18	$2,809,868		$0.18
June 30	3,991,110		0.18	3,294,938		0.18	2,902,806		0.18
September 30	4,125,060		0.18	3,456,304		0.18	2,954,616		0.18
December 31	4,316,063		0.18	3,656,622		0.18	3,062,506		0.18
	$16,285,828		$0.72	$13,563,471		$0.72	$11,729,796		$0.72

Summary of payment of dividends to preferred shareholders

Declaration Date	Record Date	Payment Date	Dividend	Dividend per Share
1/15/2014	2/18/2014	3/17/2014	$1,889,147	$0.515625
4/1/2014	5/15/2014	6/16/2014	1,889,147	0.515625
7/1/2014	8/15/2014	9/15/2014	1,889,147	0.515625
10/1/2014	11/17/2014	12/15/2014	1,889,147	0.515625
			$7,556,588	$2.0625

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	1459,458	0.515625
			$4,325,109	$2.0625