v3.26.3
Note 6 - Fair Value Measurement - Unobservable Inputs (Details)
Sep. 30, 2026
USD ($)
Residential mortgage loans, at fair value $ 84,484,411
Mortgage servicing rights investments, at fair value 6,806,924
Total 94,260,049
Fair Value, Inputs, Level 3 [Member]  
Residential mortgage loans, at fair value 84,484,411
Mortgage servicing rights investments, at fair value 6,806,924
Total 91,291,335
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Inputs, Level 3 [Member]  
Residential mortgage loans, at fair value 84,484,411
Mortgage servicing rights investments, at fair value $ 6,806,924
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 0.075
Mortgage servicing rights investments, at fair value, measurement input 0.0428
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 0.085
Mortgage servicing rights investments, at fair value, measurement input 0.298
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 0.08
Mortgage servicing rights investments, at fair value, measurement input 0.05
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 5.4
Mortgage servicing rights investments, at fair value, measurement input 8.8
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 0.0901
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 0.11
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 0.0902
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 0.0015
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 0.0037
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 0.0017