Note 6 - Fair Value - Schedule of Assets Measured on Recurring Basis (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale	$ 137,732,521	$ 140,307,447
Reported Value Measurement [Member] \| Fair Value, Recurring [Member]
Fair Value, Net Asset (Liability)	137,525,998	140,958,787
Reported Value Measurement [Member] \| Fair Value, Recurring [Member] \| Cash Flow and Fair Value Hedges [Member]
Cash flow hedge	206,523
Reported Value Measurement [Member] \| Fair Value, Recurring [Member] \| Cash Flow Hedging [Member]
Cash flow hedge		651,340
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Net Asset (Liability)	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Cash Flow and Fair Value Hedges [Member]
Cash flow hedge	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member] \| Cash Flow Hedging [Member]
Cash flow hedge		0
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Net Asset (Liability)	137,525,998	140,958,787
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash Flow and Fair Value Hedges [Member]
Cash flow hedge	206,523
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member] \| Cash Flow Hedging [Member]
Cash flow hedge		651,340
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair Value, Net Asset (Liability)	0	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Cash Flow and Fair Value Hedges [Member]
Cash flow hedge	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Cash Flow Hedging [Member]
Cash flow hedge		0
US Government Agencies Debt Securities [Member] \| Reported Value Measurement [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	2,885,238	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	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	2,885,238	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	0	0
Corporate Debt Securities [Member] \| Reported Value Measurement [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	40,063,778	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	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	40,063,778	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	0	0
US States and Political Subdivisions Debt Securities [Member] \| Reported Value Measurement [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	415,225	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	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	415,225	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	0	0
Residential Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale	79,973,603	74,552,809
Residential Mortgage-Backed Securities [Member] \| Reported Value Measurement [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	79,973,603	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	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	79,973,603	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	0	0
Commercial Mortgage-Backed Securities [Member]
Debt Securities, Available-for-Sale	14,394,677	14,334,049
Commercial Mortgage-Backed Securities [Member] \| Reported Value Measurement [Member] \| Fair Value, Recurring [Member]
Debt Securities, Available-for-Sale	14,394,677	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	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	14,394,677	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	$ 0	$ 0