Loans Payable - Summary of Loans Payable (Detail) (USD $) | 3 Months Ended | |
Mar. 31, 2015 | Dec. 31, 2014 |
Debt Instrument [Line Items] | | |
Mortgages and other indebtedness | $147,634,250 | $141,450,143 |
January 2016 [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 9.00% | |
Mortgage Loans Payable, Maturity Period | 2016-01 | |
Mortgages and other indebtedness | 2,160,000 | 2,160,000 |
Senior Convertible Notes [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 9.00% | |
Mortgage Loans Payable, Maturity Period | 2018-12 | |
Mortgages and other indebtedness | 3,000,000 | 6,000,000 |
Senior Non-Convertible Notes [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 9.00% | |
Mortgage Loans Payable, Maturity Period | 2015-12 | |
Mortgages and other indebtedness | 4,000,000 | 4,000,000 |
Shoppes at Eagle Harbor [Member] | Interest at Fixed Rate of 4.34% [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 25,100 | |
Mortgage Loans Payable, Interest Rate | 4.34% | |
Mortgage Loans Payable, Maturity Period | 2018-03 | |
Mortgages and other indebtedness | 3,738,846 | 3,773,319 |
Lumber River Plaza [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 18,414 | |
Mortgage Loans Payable, Interest Rate | 5.65% | |
Mortgage Loans Payable, Maturity Period | 2015-05 | |
Mortgages and other indebtedness | 2,874,034 | 2,894,862 |
Monarch Bank Building [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 9,473 | |
Mortgage Loans Payable, Interest Rate | 4.15% | |
Mortgage Loans Payable, Maturity Period | 2017-12 | |
Mortgages and other indebtedness | 1,417,344 | 1,430,961 |
Perimeter Square [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 28,089 | |
Mortgage Loans Payable, Interest Rate | 6.38% | |
Mortgage Loans Payable, Maturity Period | 2016-06 | |
Mortgages and other indebtedness | 4,261,754 | 4,294,216 |
Riversedge North [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 8,802 | |
Mortgage Loans Payable, Interest Rate | 6.00% | |
Mortgage Loans Payable, Maturity Period | 2019-01 | |
Mortgages and other indebtedness | 996,515 | 1,007,856 |
Walnut Hill Plaza [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 24,273 | |
Mortgage Loans Payable, Interest Rate | 5.50% | |
Mortgage Loans Payable, Maturity Period | 2017-07 | |
Mortgages and other indebtedness | 3,603,914 | 3,626,945 |
Harps at Harbor Point [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 18,122 | |
Mortgage Loans Payable, Interest Rate | 3.99% | |
Mortgage Loans Payable, Maturity Period | 2015-12 | |
Mortgages and other indebtedness | 3,229,553 | 3,251,552 |
Twin City Commons [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 17,827 | |
Mortgage Loans Payable, Interest Rate | 4.86% | |
Mortgage Loans Payable, Maturity Period | 2023-01 | |
Mortgages and other indebtedness | 3,265,375 | 3,279,076 |
Shoppes at TJ Maxx [Member] | Maturity on May 2020 [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 33,880 | |
Mortgage Loans Payable, Interest Rate | 3.88% | |
Mortgage Loans Payable, Maturity Period | 2020-05 | |
Mortgages and other indebtedness | 6,207,185 | 6,248,349 |
Bixby Commons [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | InterestB only | |
Mortgage Loans Payable, Interest Rate | 2.77% | |
Mortgage Loans Payable, Maturity Period | 2018-06 | |
Mortgages and other indebtedness | 6,700,000 | 6,700,000 |
Line of Credit [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 4.25% | |
Line of Credit, Current | 2,074,432 | |
Mortgage Loans Payable, Maturity Period | 2015-09 | |
Mortgages and other indebtedness | | 2,074,432 |
Forrest Gallery [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 50,973 | |
Mortgage Loans Payable, Interest Rate | 5.40% | |
Mortgage Loans Payable, Maturity Period | 2023-09 | |
Mortgages and other indebtedness | 9,015,020 | 9,045,880 |
Jenks Reasors [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 4.25% | |
Mortgage Loans Payable, Maturity Period | 2016-09 | |
Mortgages and other indebtedness | 8,550,000 | 8,550,000 |
Tampa Festival [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 50,797 | |
Mortgage Loans Payable, Interest Rate | 5.56% | |
Mortgage Loans Payable, Maturity Period | 2023-09 | |
Mortgages and other indebtedness | 8,715,930 | 8,746,860 |
Starbucks/Verizon [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 4,383 | |
Mortgage Loans Payable, Interest Rate | 5.00% | |
Mortgage Loans Payable, Maturity Period | 2019-07 | |
Mortgages and other indebtedness | 647,027 | 652,044 |
Winslow Plaza [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 5.22% | |
Mortgage Loans Payable, Maturity Period | 2015-12 | |
Mortgages and other indebtedness | 5,000,000 | 5,000,000 |
Cypress Shopping Center [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 4.70% | |
Mortgage Loans Payable, Maturity Period | 2024-07 | |
Mortgages and other indebtedness | 6,625,000 | 6,625,000 |
Harrodsburg Marketplace [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 19112 | |
Mortgage Loans Payable, Interest Rate | 4.55% | |
Mortgage Loans Payable, Maturity Period | 2024-09 | |
Mortgages and other indebtedness | 3,720,847 | 3,735,739 |
Port Crossing Shopping Center [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 34,788 | |
Mortgage Loans Payable, Interest Rate | 4.84% | |
Mortgage Loans Payable, Maturity Period | 2024-08 | |
Mortgages and other indebtedness | 6,543,952 | 6,568,918 |
LaGrange Marketplace [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 13813 | |
Mortgage Loans Payable, Interest Rate | 5.00% | |
Mortgage Loans Payable, Maturity Period | 2020-02 | |
Mortgages and other indebtedness | 2,453,229 | 2,463,909 |
Freeway Junction [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 4.60% | |
Mortgage Loans Payable, Maturity Period | 2024-09 | |
Mortgages and other indebtedness | 8,150,000 | 8,150,000 |
DF I-Courtland [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 1,411 | |
Mortgage Loans Payable, Interest Rate | 6.50% | |
Mortgage Loans Payable, Maturity Period | 2019-01 | |
Mortgages and other indebtedness | 113,365 | 115,728 |
DF I-Edenton [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Interest Rate | 3.75% | |
Mortgage Loans Payable, Maturity Period | 2016-09 | |
Mortgages and other indebtedness | 1,400,000 | 1,650,000 |
Debt Instrument, Periodic Payment, Principal | 250,000 | |
DF I-Moyock [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 10,665 | |
Mortgage Loans Payable, Interest Rate | 5.00% | |
Mortgage Loans Payable, Maturity Period | 2019-07 | |
Mortgages and other indebtedness | 496,862 | 522,430 |
Graystone Crossing [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 20386 | |
Mortgage Loans Payable, Interest Rate | 4.55% | |
Mortgage Loans Payable, Maturity Period | 2024-10 | |
Mortgages and other indebtedness | 4,000,000 | 4,000,000 |
Bryan Station [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 4.52% | |
Mortgage Loans Payable, Maturity Period | 2024-11 | |
Mortgages and other indebtedness | 4,625,000 | 4,625,000 |
Crockett Square [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 4.47% | |
Mortgage Loans Payable, Maturity Period | 2024-12 | |
Mortgages and other indebtedness | 6,337,500 | 6,337,500 |
Harbor Point [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | 11,024 | |
Mortgage Loans Payable, Interest Rate | 5.85% | |
Mortgage Loans Payable, Maturity Period | 2016-12 | |
Mortgages and other indebtedness | 1,536,566 | 1,544,567 |
Pierpont Centre [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 4.15% | |
Mortgage Loans Payable, Maturity Period | 2025-02 | |
Mortgages and other indebtedness | 9,800,000 | 0 |
South Carolina Food Lions Note [Member] | | |
Debt Instrument [Line Items] | | |
Mortgage Loans Payable, Monthly Payment | Interest only | |
Mortgage Loans Payable, Interest Rate | 5.25% | |
Mortgage Loans Payable, Maturity Period | 2024-01 | |
Mortgages and other indebtedness | $12,375,000 | $12,375,000 |