Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Capital Amounts and Ratios (Details) - Bank [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Tier 1 (core) capital to adjusted assets, actual, amount	$ 85,255	$ 78,635
Tier 1 (core) capital to adjusted assets, actual, ratio	12.50%	12.20%
Tier 1 (core) capital to adjusted assets, for capital adequacy, amount	$ 27,283	$ 25,844
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	$ 34,103	$ 32,305
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	$ 85,255	$ 78,635
Tier 1 (core) capital to risk-weighted assets, actual, ratio	14.00%	13.40%
Tier 1 (core) capital to risk-weighted assets, for capital adequacy, amount	$ 36,434	$ 23,403
Tier 1 (core) capital to risk-weighted assets, for capital adequacy, ratio	6.00%	4.00%
Tier 1 (core) capital to risk-weighted assets, under prompt corrective action, amount	$ 48,578	$ 35,105
Tier 1 (core) capital to risk-weighted assets, under prompt corrective action, ratio	8.00%	6.00%
Total risk-based capital, actual, amount	$ 90,997	$ 84,447
Total risk-based capital, actual, ratio	15.00%	14.40%
Total risk-based capital, for capital adequacy, amount	$ 48,578	$ 46,806
Total risk-based capital, for capital adequacy, ratio	8.00%	8.00%
Total risk-based capital, under prompt corrective action, amount	$ 60,723	$ 58,508
Total risk-based capital, under prompt corrective action, ratio	10.00%	10.00%
Common equity tier 1 capital to risk-weighted assets, amount	$ 85,255	$ 78,635
Common equity tier 1 capital to risk-weighted assets, ratio	14.00%	13.40%
Common equity tier 1 capital to risk-weighted assets for capital adequacy, amount	$ 27,325	$ 26,329
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	$ 39,470	$ 38,030
Common equity tier 1 capital to risk-weighted assets, under prompt corrective action, ratio	6.50%	6.50%