Annual report pursuant to Section 13 and 15(d)

Note 7 - Variable Interest Entities (VIEs) (Details Textual)

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Note 7 - Variable Interest Entities (VIEs) (Details Textual)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Loan [Member]    
Limited Partners' Capital Account $ 0 $ 2,022,000,000
Variable Interest Entity, Not Primary Beneficiary [Member]    
Limited Partners' Capital Account 42,800,000 $ 46,300,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Federal Historic Tax Credit Partnerships [Member]    
Limited Partners' Capital Account $ 754,000  
Variable Interest Entity, Number of Investments 2  
Limited Partners' Contributed Capital $ 2,400,000  
Variable Interest Entity, Not Primary Beneficiary [Member] | Low-Income Housing Tax Credit Partnerships [Member]    
Limited Partners' Capital Account $ 7,800,000  
Variable Interest Entity, Number of Investments 6