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Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Capital Amounts and Ratios (Details) - Bank [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Tier 1 (core) capital to adjusted assets, actual, amount $ 89,526 $ 85,255
Tier 1 (core) capital to adjusted assets, actual, ratio 11.50% 12.50%
Tier 1 (core) capital to adjusted assets, for capital adequacy, amount $ 31,227 $ 27,283
Tier 1 (core) capital to adjusted assets, for capital adequacy, ratio 4.00% 4.00%
Tier 1 (core) capital to adjusted assets, under prompt corrective action, amount $ 39,034 $ 34,103
Tier 1 (core) capital to adjusted assets, under prompt corrective action, ratio 5.00% 5.00%
Tier 1 (core) capital to risk-weighted assets, actual, amount $ 89,526 $ 85,255
Tier 1 (core) capital to risk-weighted assets, actual, ratio 12.50% 14.00%
Tier 1 (core) capital to risk-weighted assets, for capital adequacy, amount $ 42,939 $ 36,434
Tier 1 (core) capital to risk-weighted assets, for capital adequacy, ratio 6.00% 6.00%
Tier 1 (core) capital to risk-weighted assets, under prompt corrective action, amount $ 57,252 $ 48,578
Tier 1 (core) capital to risk-weighted assets, under prompt corrective action, ratio 8.00% 8.00%
Total risk-based capital, actual, amount $ 96,633 $ 90,997
Total risk-based capital, actual, ratio 13.50% 15.00%
Total risk-based capital, for capital adequacy, amount $ 57,252 $ 48,578
Total risk-based capital, for capital adequacy, ratio 8.00% 8.00%
Total risk-based capital, under prompt corrective action, amount $ 71,565 $ 60,723
Total risk-based capital, under prompt corrective action, ratio 10.00% 10.00%
Common equity tier 1 capital to risk-weighted assets, amount $ 89,526 $ 85,255
Common equity tier 1 capital to risk-weighted assets, ratio 12.50% 14.00%
Common equity tier 1 capital to risk-weighted assets for capital adequacy, amount $ 32,204 $ 27,325
Common equity tier 1 capital to risk-weighted assets, for capital adequacy, ratio 4.50% 4.50%
Common equity tier 1 capital to risk-weighted assets, under prompt corrective action, amount $ 46,517 $ 39,470
Common equity tier 1 capital to risk-weighted assets, under prompt corrective action, ratio 6.50% 6.50%