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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

X

- Definition

Fair value of all asset derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
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-Section 50
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Fair value of all liability derivatives designated as cash flow hedging instruments.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
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