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Note 2 - Significant Accounting Policies - Estimated Useful Lives of Assets (Details)
3 Months Ended
Mar. 31, 2022
Building and Building Improvements [Member]  
Estimated useful life (Year) 44 years
Building and Building Improvements [Member] | Minimum [Member]  
Estimated useful life (Year) 10 years
Furniture, Fixtures and Equipment [Member]  
Estimated useful life (Year) 15 years
Furniture, Fixtures and Equipment [Member] | Minimum [Member]  
Estimated useful life (Year) 3 years