Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Capital Amounts and Ratios (Details) - Bank [Member] $ in Thousands	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Bank Leverage Capital, Actual	$ 111,098	$ 104,480
Bank Leverage Capital, Ratio	0.100	0.105
Bank Leverage Capital, to be Well Capitalized	$ 89,175	$ 50,103
Bank Leverage Capital, to be Well Capitalized, Ratio	0.080	0.050
Tier 1 (core) capital to adjusted assets, for capital adequacy, amount		$ 40,083
Tier 1 (core) capital to adjusted assets, for capital adequacy, ratio		0.040
Tier 1 (core) capital to risk-weighted assets, actual, amount		$ 104,480
Tier 1 (core) capital to risk-weighted assets, actual, ratio		0.124
Tier 1 (core) capital to risk-weighted assets, for capital adequacy, amount		$ 50,727
Tier 1 (core) capital to risk-weighted assets, for capital adequacy, ratio		0.060
Tier 1 (core) capital to risk-weighted assets, under prompt corrective action, amount		$ 67,636
Tier 1 (core) capital to risk-weighted assets, under prompt corrective action, ratio		0.080
Total risk-based capital, actual, amount		$ 112,088
Total risk-based capital, actual, ratio		0.133
Total risk-based capital, for capital adequacy, amount		$ 67,636
Total risk-based capital, for capital adequacy, ratio		0.080
Total risk-based capital, under prompt corrective action, amount		$ 84,545
Total risk-based capital, under prompt corrective action, ratio		0.100
Common equity tier 1 capital to risk-weighted assets, amount		$ 104,480
Common equity tier 1 capital to risk-weighted assets, ratio		0.124
Common equity tier 1 capital to risk-weighted assets for capital adequacy, amount		$ 38,045
Common equity tier 1 capital to risk-weighted assets, for capital adequacy, ratio		0.045
Common equity tier 1 capital to risk-weighted assets, under prompt corrective action, amount		$ 54,954
Common equity tier 1 capital to risk-weighted assets, under prompt corrective action, ratio		0.065