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Note 2 - Significant Accounting Policies - Assets Measured on a Nonrecurring Basis (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Total Assets, impairment loss | $ 6,443,437 | $ 1,969,311
NTR Property Management [Member] |  |
Goodwill, impairment loss | 72,000 |
Fair Value, Nonrecurring [Member] |  |
Certain Real Estate assets | 24,499,935 | 18,065,871
Certain Real Estate assets, impairment loss | 6,371,437 | 1,784,311
Total Assets | 24,693,935 | 18,331,871
Total Assets, impairment loss | 6,443,437 | 1,969,311
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Certain Real Estate assets | 0 | 0
Total Assets | 0 | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Certain Real Estate assets | 0 | 0
Total Assets | 0 | 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Certain Real Estate assets | 24,499,935 | 18,065,871
Total Assets | $ 24,693,935 | 18,331,871
Fair Value, Nonrecurring [Member] | NTR Property Management [Member] |  |
Goodwill, Impairment Loss, Statement of Income or Comprehensive Income [Extensible Enumeration] | Total Assets, impairment loss |
Goodwill | $ 194,000 | 266,000
Goodwill, impairment loss | 72,000 | 185,000
Fair Value, Nonrecurring [Member] | NTR Property Management [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Goodwill | 0 | 0
Fair Value, Nonrecurring [Member] | NTR Property Management [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Goodwill | 0 | 0
Fair Value, Nonrecurring [Member] | NTR Property Management [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Goodwill | $ 194,000 | $ 266,000

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