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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, 2025
USD ($)
Corporate Debt Securities [Member]  
Fair value, beginning of period $ 169,600
Principal payment 0
Acquisition 0
Investment related gains (losses), net 0
Fair value, end of period 169,600
Collateralized Mortgage-Backed Securities [Member]  
Fair value, beginning of period 343,750
Principal payment (3,750)
Acquisition 0
Investment related gains (losses), net 0
Fair value, end of period 340,000
Term Loans [Member]  
Fair value, beginning of period 12,788,304
Principal payment (826,472)
Acquisition 39,273
Investment related gains (losses), net 787,199
Fair value, end of period 12,788,304
Other Invested Assets [Member]  
Fair value, beginning of period 1,109,606
Principal payment 0
Acquisition 0
Investment related gains (losses), net 75,965
Fair value, end of period $ 1,185,571