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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, 2024
USD ($)
Corporate Debt Securities [Member]  
Fair value, beginning of period $ 169,600
Principal payment 0
Acquisition 0
Investment related gains (losses) 0
Fair value, end of period 169,600
Collateralized Mortgage-Backed Securities [Member]  
Fair value, beginning of period 487,500
Principal payment 0
Acquisition 0
Investment related gains (losses) 0
Fair value, end of period 487,500
Term Loans [Member]  
Fair value, beginning of period 17,052,420
Principal payment (542,587)
Acquisition 152,284
Investment related gains (losses) (818)
Fair value, end of period 16,661,299
Other Invested Assets [Member]  
Fair value, beginning of period 2,239,683
Principal payment (5,440)
Acquisition 26,320
Investment related gains (losses) (26,314)
Fair value, end of period $ 2,234,249