CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities
Net income	$ 14,567,536	$ 13,856,859
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	5,130,962	4,323,297
Amortization	1,827,470	1,313,904
Stock-based compensation	1,391,785	1,236,000
Impairment charge	450,000	0
Gain on sale of assets	(946,347)	(1,746,750)
(Increase) decrease in accounts receivable	(201,050)	(592,064)
(Increase) decrease in other assets	(130,958)	(1,463,254)
(Decrease) increase in accounts payable	(549,019)	(1,978,649)
Decrease in deferred revenue	(347,535)	(347,535)
Increase (decrease) in accrued interest	36,485	(242,269)
Increase (decrease) in tenant deposits	(13,090)	(19,814)
Net Cash Provided by Operating Activities	21,216,239	14,339,725
Cash Flows from Investing Activities
Acquisition of real estate investments (including capitalized interest of $438,843 in 2013, $104,254 in 2012)	(79,512,790)	(44,849,100)
Payment of leasing costs	(8,950)	(14,241)
Net proceeds from sale of assets	5,462,280	15,330,481
Increase in restricted cash	0	(3,280,616)
Net Cash Used In Investing Activities	(74,059,460)	(32,813,476)
Cash Flows from Financing Activities
Proceeds from common stock offering	44,802,340	35,042,235
Note payable borrowings	86,894,408	59,062,100
Note payable repayments	(90,424,413)	(60,665,998)
Payments of mortgages payable	(2,586,204)	(2,328,560)
Term loan payable proceeds	35,000,000	0
Dividends paid	(15,430,910)	(13,089,390)
Limited partners' distributions paid	(424,095)	(417,141)
Repayments of payables for capital expenditures	(122,080)	(424,321)
Payments for financing costs	(311,522)	(164,851)
Net Cash Provided by Financing Activities	57,397,524	17,014,074
Net (Decrease) in Cash and Cash Equivalents	4,554,304	(1,459,677)
Cash and Cash Equivalents, beginning of period	1,270,027	2,002,663
Cash and Cash Equivalents, end of period	5,824,331	542,986
Supplemental Disclosure of Cash Flow Information
Cash paid for interest (net of amounts capitalized)	4,464,126	3,412,222
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Shares issued under Stock Incentive Plan	2,390,208	2,175,831
Dividends and limited partners' distributions declared and unpaid	5,571,089	4,711,946
Real estate investments financed with accounts payable	322,719	35,045
Forgiveness of mortgage debt	0	9,173,789
Real estate acquisitions financed with debt assumption	$ 0	$ 18,220,528