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Note 4 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Recurring [Member]
3 Months Ended
Mar. 31, 2026
USD ($)
Corporate Debt Securities [Member]  
Fair value, beginning of period $ 155,600
Principal payment 0
Acquisition 0
Investment related gains (losses), net 0
Fair value, end of period 155,600
Collateralized Mortgage-Backed Securities [Member]  
Fair value, beginning of period 333,750
Principal payment 0
Acquisition 0
Investment related gains (losses), net (5,000)
Fair value, end of period 328,750
Term Loans [Member]  
Fair value, beginning of period 11,005,804
Principal payment (554,671)
Acquisition 1,587,173
Investment related gains (losses), net 55,079
Fair value, end of period 12,093,385
Other Invested Assets [Member]  
Fair value, beginning of period 1,018,640
Principal payment (15)
Acquisition 33,551
Investment related gains (losses), net (40,049)
Fair value, end of period 1,012,127
Limited Partnership Interests [Member]  
Fair value, beginning of period 1,293,005
Principal payment (192,000)
Acquisition 481,998
Investment related gains (losses), net 128,173
Fair value, end of period $ 1,711,176