Note 3 - Residential Mortgage Loans - at Fair Value - Loans Past Due (Details)	9 Months Ended
Sep. 30, 2026 USD ($)
Acquisition cost	$ 88,269,183
Unpaid principal balance	$ 92,240,090
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Number of mortgage loans 90 or more days past due	4
Acquisition cost	$ 2,594,560
Unpaid principal balance	$ 2,714,898
Financial Asset, Past Due [Member] \| Loans in Foreclosure [Member]
Number of mortgage loans 90 or more days past due	6
Unpaid principal balance	$ 3,154,742
Recorded investment in mortgage loans in foreclosure	$ 3,154,592

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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+ Details