v3.26.1
Note 6 - Fair Value Measurement - Unobservable Inputs (Details)
Jun. 30, 2026
USD ($)
Residential mortgage loans, at fair value $ 44,917,370
Mortgage servicing rights investments, at fair value 9,177,251
Fair value, assets 54,719,817
Fair Value, Inputs, Level 3 [Member]  
Residential mortgage loans, at fair value 44,917,370
Mortgage servicing rights investments, at fair value 9,177,251
Fair value, assets 54,094,621
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member]  
Residential mortgage loans, at fair value 44,917,370
Mortgage servicing rights investments, at fair value $ 9,177,251
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]  
Residential mortgage loans, at fair value, measurement input 0.065
Mortgage servicing rights investments, at fair value, measurement input 0.0901
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]  
Residential mortgage loans, at fair value, measurement input 0.075
Mortgage servicing rights investments, at fair value, measurement input 0.0902
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [Member]  
Residential mortgage loans, at fair value, measurement input 0.07
Mortgage servicing rights investments, at fair value, measurement input 0.0901
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Expected Term [Member] | Weighted Average [Member]  
Residential mortgage loans, at fair value, measurement input 5.5
Mortgage servicing rights investments, at fair value, measurement input 7.7
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Minimum [Member]  
Mortgage servicing rights investments, at fair value, measurement input 0.0521
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Maximum [Member]  
Mortgage servicing rights investments, at fair value, measurement input 0.0758
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Prepayment Rate [Member] | Weighted Average [Member]  
Mortgage servicing rights investments, at fair value, measurement input 0.0721
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Default Rate [Member] | Minimum [Member]  
Mortgage servicing rights investments, at fair value, measurement input 0.0012
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Default Rate [Member] | Maximum [Member]  
Mortgage servicing rights investments, at fair value, measurement input 0.0013
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Default Rate [Member] | Weighted Average [Member]  
Mortgage servicing rights investments, at fair value, measurement input 0.0013