NSTS Bancorp, Inc. Quarterly report [Sections 13 or 15(d)]

Quarterly report [Sections 13 or 15(d)]

Note 6 - Fair Value Measurements - Fair Value On Recurring Basis (Details)

Note 6 - Fair Value Measurements - Fair Value On Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available for sale	$ 79,561	$ 71,249
US Treasury Notes Securities [Member]
Securities available for sale	7,077
US Government Agencies Debt Securities [Member]
Securities available for sale	8,516	8,657
Municipal Bonds [Member]
Securities available for sale	11,930	11,736
Residential Mortgage-Backed Securities [Member]
Securities available for sale	24,529	25,915
Fair Value, Recurring [Member]
Securities available for sale	79,561	71,249
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale	7,077	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale	72,484	71,249
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| US Treasury Notes Securities [Member]
Securities available for sale	7,077
Fair Value, Recurring [Member] \| US Treasury Notes Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale	7,077
Fair Value, Recurring [Member] \| US Treasury Notes Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale	0
Fair Value, Recurring [Member] \| US Treasury Notes Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0
Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member]
Securities available for sale	8,516	8,657
Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale	8,516	8,657
Fair Value, Recurring [Member] \| US Government Agencies Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| Municipal Bonds [Member]
Securities available for sale	11,930	11,736
Fair Value, Recurring [Member] \| Municipal Bonds [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| Municipal Bonds [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale	11,930	11,736
Fair Value, Recurring [Member] \| Municipal Bonds [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| Residential Mortgage-Backed Securities [Member]
Securities available for sale	24,529	25,915
Fair Value, Recurring [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale	24,529	25,915
Fair Value, Recurring [Member] \| Residential Mortgage-Backed Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| Collateralized Mortgage Obligations [Member]
Securities available for sale	27,509	24,941
Fair Value, Recurring [Member] \| Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Fair Value, Recurring [Member] \| Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 2 [Member]
Securities available for sale	27,509	24,941
Fair Value, Recurring [Member] \| Collateralized Mortgage Obligations [Member] \| Fair Value, Inputs, Level 3 [Member]
Securities available for sale	$ 0	$ 0