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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