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

Represents the amount of real estate at fair value.

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Fair value portion of asset recognized for present right to economic benefit.

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