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Segment Disclosures - Summary of Reportable Segments (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenues:      
Total revenues $ 232,991,744 $ 212,643,094 $ 168,764,571
Operating expenses:      
General and administrative 27,451,533 28,253,905 23,265,196
Depreciation 53,636,353 49,417,679 40,946,406
Intangible amortization expense 6,593,853 15,200,854 12,422,205
Acquisition expenses 192,358 888,009 934,838
Contingent earnout adjustment 0 1,514,447 12,619,744
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control   2,049,682 8,389,573
Total operating expenses 162,366,808 162,875,473 152,435,452
Gain on sale of real estate 0 0 178,631
Gain resulting from acquisition of unconsolidated affiliates   16,101,237  
Income from operations 70,624,936 65,868,858 16,507,750
Other income (expense):      
Other, net 3,128,867 841,401 (937,631)
Interest expense (61,804,621) (41,511,911) (33,383,604)
Net loss on extinguishment of debt 0 (2,393,475) (2,444,788)
Income tax (expense) benefit 2,595,856 554,785 1,811,275
Net income (loss) 11,646,760 21,669,452 (19,564,718)
Self Storage      
Revenues:      
Total revenues 215,321,070 200,195,381 158,162,934
Operating expenses:      
Depreciation 52,754,196 48,503,743 40,203,484
Intangible amortization expense 6,398,131 14,728,148 11,134,100
Acquisition expenses 192,358 888,009 934,838
Total operating expenses 124,707,542 122,557,010 100,400,079
Gain on sale of real estate     178,631
Income from operations 90,613,528 77,638,371 57,941,486
Other income (expense):      
Other, net 217,807 (209,578) (173,245)
Interest expense (61,636,064) (41,339,401) (33,207,310)
Net loss on extinguishment of debt   (2,393,475) (2,444,788)
Income tax (expense) benefit 2,400,878 36,197 (193,604)
Net income (loss) 31,596,149 33,732,114 (21,922,539)
Managed REIT Platform      
Revenues:      
Total revenues 17,670,674 12,447,713 10,601,637
Operating expenses:      
Intangible amortization expense 195,722 472,706 1,288,105
Contingent earnout adjustment   1,514,447 12,619,744
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control   2,049,682  
Total operating expenses 9,325,576 11,150,622 28,027,255
Gain resulting from acquisition of unconsolidated affiliates   16,101,237  
Income from operations 8,345,098 (17,398,328) (17,425,618)
Other income (expense):      
Other, net 3,359,875 (1,085,533) 20,990
Income tax (expense) benefit (196,599) 563,053 2,004,879
Net income (loss) 10,235,231 (18,116,713) (16,023,142)
Corporate and Other      
Other income (expense):      
Equity in earnings (loss) of unconsolidated real estate ventures (1,625,135) (760,005) (494,327)
Corporate and Other      
Operating expenses:      
General and administrative 27,451,533 28,253,905 23,265,196
Depreciation 882,157 913,936 742,922
Total operating expenses 28,333,690 29,167,841 24,008,118
Income from operations (28,333,690) (29,167,841) (24,008,118)
Other income (expense):      
Other, net (448,815) (34,554) (785,376)
Interest expense 168,557 172,510 176,294
Income tax (expense) benefit 391,577 44,465  
Net income (loss) (30,184,620) (30,179,375) (25,464,115)
J V Properties      
Other income (expense):      
Equity in earnings (loss) of unconsolidated real estate ventures (1,625,135) (760,005) (494,327)
J V Properties | Corporate and Other      
Other income (expense):      
Equity in earnings (loss) of unconsolidated real estate ventures (1,625,135) (760,005) (494,327)
Self Storage Rental Revenue      
Revenues:      
Total revenues 206,494,202 191,749,578 150,610,337
Self Storage Rental Revenue | Self Storage      
Revenues:      
Total revenues 206,494,202 191,749,578 150,610,337
Ancillary Operating Revenue      
Revenues:      
Total revenues 8,826,868 8,445,803 7,552,597
Ancillary Operating Revenue | Self Storage      
Revenues:      
Total revenues 8,826,868 8,445,803 7,552,597
Managed REIT Platform Revenue      
Revenues:      
Total revenues 11,906,311 7,819,216 6,322,970
Managed REIT Platform Revenue | Managed REIT Platform      
Revenues:      
Total revenues 11,906,311 7,819,216 6,322,970
Reimbursable Costs from Managed REITs      
Revenues:      
Total revenues 5,764,363 4,628,497 4,278,667
Operating expenses:      
Operating expenses 5,764,363 4,628,497 4,278,667
Reimbursable Costs from Managed REITs | Managed REIT Platform      
Revenues:      
Total revenues 5,764,363 4,628,497 4,278,667
Operating expenses:      
Operating expenses 5,764,363 4,628,497 4,278,667
Property Operating Expenses      
Operating expenses:      
Operating expenses 65,362,857 58,437,110 48,127,657
Property Operating Expenses | Self Storage      
Operating expenses:      
Operating expenses 65,362,857 58,437,110 48,127,657
Managed REIT Platform Expenses      
Operating expenses:      
Operating expenses 3,365,491 2,485,290 1,451,166
Write-off of equity interest and preexisting relationships in SST IV upon acquisition of control     8,389,573
Managed REIT Platform Expenses | Managed REIT Platform      
Operating expenses:      
Operating expenses 3,365,491 2,485,290 1,451,166
Managed REITS      
Other income (expense):      
Equity in earnings (loss) of unconsolidated real estate ventures (1,273,143) (930,201) (623,393)
Managed REITS | Managed REIT Platform      
Other income (expense):      
Equity in earnings (loss) of unconsolidated real estate ventures $ (1,273,143) $ (930,201) $ (623,393)