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Note 12 - Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | March 31, 2022 |  |  | December 31, 2021 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Notes payable, net (1) |  | $ | 7,110,804 |  |  | $ | 6,875,691 |  |  | $ | 7,027,050 |  |  | $ | 7,330,723 |
Mortgages payable, net (2) |  | $ | 378,644 |  |  | $ | 361,700 |  |  | $ | 448,652 |  |  | $ | 449,758 |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  | Balance at March 31, 2022 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Marketable equity securities |  | $ | 1,334,873 |  |  | $ | 1,334,873 |  |  | $ | - |  |  | $ | - |
|  | Balance at December 31, 2021 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Marketable equity securities |  | $ | 1,211,739 |  |  | $ | 1,211,739 |  |  | $ | - |  |  | $ | - |
|  | Balance at December 31, 2021 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Other investments |  | $ | 9,834 |  |  | $ | - |  |  | $ | - |  |  | $ | 9,834 |

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