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Note 6 - Fair Value - Schedule of Assets Measured on Recurring Basis (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 160,747,239 | $ 140,307,447
Reported Value Measurement [Member] | Fair Value, Recurring [Member] |  |
Fair value hedge | 51,606 | 109,594
Cash flow hedge | 187,703 |
Fair value hedge | 51,606 |
Fair value, net | 160,559,536 | 141,068,381
Cash flow hedge |  | 651,340
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair value hedge | 0 | 0
Cash flow hedge | 0 |
Fair value hedge | 0 |
Fair value, net | 0 | 0
Cash flow hedge |  | 0
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair value hedge | 51,606 | 109,594
Cash flow hedge | 187,703 |
Fair value hedge | 51,606 |
Fair value, net | 160,559,536 | 141,068,381
Cash flow hedge |  | 651,340
Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair value hedge | 0 | 0
Cash flow hedge | 0 |
Fair value hedge | 0 |
Fair value, net | 0 | 0
Cash flow hedge |  | 0
US Government Agencies Debt Securities [Member] | Reported Value Measurement [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 2,929,179 | 12,792,540
US Government Agencies Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
US Government Agencies Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 2,929,179 | 12,792,540
US Government Agencies Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Corporate Debt Securities [Member] | Reported Value Measurement [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 46,330,900 | 38,229,775
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 46,330,900 | 38,229,775
Corporate Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Reported Value Measurement [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 424,280 | 398,275
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 424,280 | 398,275
US States and Political Subdivisions Debt Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Residential Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 99,331,011 | 74,552,809
Residential Mortgage-Backed Securities [Member] | Reported Value Measurement [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 99,331,011 | 74,552,809
Residential Mortgage-Backed Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Residential Mortgage-Backed Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 99,331,011 | 74,552,809
Residential Mortgage-Backed Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Commercial Mortgage-Backed Securities [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 11,731,869 | 14,334,049
Commercial Mortgage-Backed Securities [Member] | Reported Value Measurement [Member] | Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 11,731,869 | 14,334,048
Commercial Mortgage-Backed Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 0 | 0
Commercial Mortgage-Backed Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | 11,731,869 | 14,334,048
Commercial Mortgage-Backed Securities [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest | $ 0 | $ 0

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