CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash Flows from Operating Activities
Net income	$ 5,392,258	$ 4,741,835
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	1,611,451	1,449,778
Amortization	520,706	353,718
Stock-based compensation	470,110	412,000
Gain on sale of assets	(946,347)	(908,160)
(Increase) decrease in accounts receivable	441,789	197,360
(Increase) decrease in other assets	(194,408)	(288,822)
(Decrease) increase in accounts payable	(411,442)	(1,756,591)
Decrease in deferred revenue	(115,845)	(115,845)
Increase (decrease) in accrued interest	101,301	(260,676)
Increase (decrease) in tenant deposits	(2,500)	(1,400)
Net Cash Provided by Operating Activities	6,867,073	3,823,197
Cash Flows from Investing Activities
Acquisition of real estate investments (including capitalized interest of $203,558 in 2013, $0 in 2012)	(16,968,082)	(9,726,161)
Payment of leasing costs	0	(625)
Net proceeds from sale of assets	5,462,280	627,118
Net Cash Used In Investing Activities	(11,505,802)	(9,099,668)
Cash Flows from Financing Activities
Proceeds from common stock offering	44,810,620	35,042,235
Note payable borrowings	17,242,796	13,943,606
Note payable repayments	(51,772,801)	(40,002,806)
Payments of mortgages payable	(850,027)	(739,776)
Dividends paid	(4,574,418)	(3,940,766)
Limited partners' distributions paid	(139,047)	(139,047)
Repayments of payables for capital expenditures	(122,080)	(424,321)
Payments for financing costs	(27,311)
Net Cash Provided by Financing Activities	4,567,732	3,739,125
Net Increase (Decrease) in Cash and Cash Equivalents	(70,997)	(1,537,346)
Cash and Cash Equivalents, beginning of period	1,270,027	2,002,663
Cash and Cash Equivalents, end of period	1,199,030	465,317
Supplemental Disclosure of Cash Flow Information
Cash paid for interest (net of amounts capitalized)	1,146,919	1,282,681
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Shares issued under Stock Incentive Plan	2,257,195	2,166,270
Dividends and limited partners' distributions declared and unpaid	5,571,680	4,697,001
Real estate investments financed with accounts payable	85,874	54,321
Forgiveness of mortgage debt	$ 0	$ 9,173,789