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Note 12 - Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
|  | June 30, 2021 |  |  | December 31, 2020 |
|  | Carrying Value |  |  | Fair Value |  |  | Carrying Value |  |  | Fair Value |
Notes payable, net (1) |  | $ | 5,047,529 |  |  | $ | 5,443,088 |  |  | $ | 5,044,208 |  |  | $ | 5,486,953 |
Mortgages payable, net (2) |  | $ | 167,976 |  |  | $ | 169,756 |  |  | $ | 311,272 |  |  | $ | 312,933 |
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] |
|  | Balance at June 30, 2021 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Marketable equity securities |  | $ | 792,136 |  |  | $ | 792,136 |  |  | $ | - |  |  | $ | - |
|  | Balance at December 31, 2020 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Marketable equity securities |  | $ | 706,954 |  |  | $ | 706,954 |  |  | $ | - |  |  | $ | - |
|  | Balance at December 31, 2020 |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Real estate |  | $ | 24,899 |  |  | $ | - |  |  | $ | - |  |  | $ | 24,899 |
Other real estate investments |  | $ | 5,464 |  |  | $ | - |  |  | $ | - |  |  | $ | 5,464 |

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