Note 7 - Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Banking Regulation, Tier 1 Leverage Capital, Actual	$ 17,297	$ 13,916
Tier 1 Leverage Ratio, Ratio	0.461	0.378
Banking Regulation, Tier 1 Leverage Capital, Capital Adequacy, Minimum	$ 1,501	$ 1,472
Banking Regulation, Tier 1 Leverage Capital Ratio, Capital Adequacy, Minimum	0.04	0.04
Banking Regulation, Tier 1 Leverage Capital, Well Capitalized, Minimum	$ 1,876	$ 1,841
Banking Regulation, Tier 1 Leverage Capital Ratio, Well Capitalized, Minimum	0.05	0.05
Common Equity Tier 1 Risk-Based Capital Ratio, Amount	$ 17,297	$ 13,916
Common Equity Tier 1 Risk-Based Capital Ratio, Ratio	0.9721	0.738
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 801	$ 849
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	0.045	0.045
Banking Regulation, Common Equity Tier 1 Risk-Based Capital, Well Capitalized, Minimum	$ 1,157	$ 1,226
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum	0.065	0.065
Banking Regulation, Tier 1 Risk-Based Capital, Actual	$ 17,297	$ 13,916
Tier 1 Risk-Based Capital Ratio, Ratio	0.9721	0.738
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy, Minimum	$ 1,068	$ 1,131
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum	0.06	0.06
Banking Regulation, Tier 1 Risk-Based Capital, Well Capitalized, Minimum	$ 1,424	$ 1,508
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum	0.08	0.08
Total Risk-Based Capital Ratio, Amount	$ 17,482	$ 14,101
Total Risk-Based Capital Ratio, Ratio	0.9825	0.7478
Banking Regulation, Total Risk-Based Capital, Capital Adequacy, Minimum	$ 1,424	$ 1,508
Total Risk-Based Capital	0.08	0.08
Banking Regulation, Total Risk-Based Capital, Well Capitalized, Minimum	$ 1,779	$ 1,886
Banking Regulation, Total Risk-Based Capital Ratio, Well Capitalized, Minimum	0.10	0.10

Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B