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Note 15 - Regulatory Capital Ratios - Capital Ratios and Minimum Capital Requirements of Bank (Details) - USD ($)
Mar. 31, 2018
Mar. 31, 2017
Common equity tier 1 capital (to risk-weighted assets) $ 47,308 $ 48,318
Common equity tier 1 capital (to risk-weighted assets) 12.79% 14.56%
Common equity tier 1 capital (to risk-weighted assets) [1] $ 24,044 $ 21,566
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets [1] 6.50% 6.50%
Total risk-based capital (to risk-weighted assets) $ 50,180 $ 50,568
Total risk-based capital (to risk-weighted assets) 13.57% 15.24%
Total risk-based capital (to risk-weighted assets) [1] $ 36,992 $ 33,179
Capital Required to be Well Capitalized to Risk Weighted Assets [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 47,308 $ 48,318
Tier 1 capital (to risk-weighted assets) 12.79% 14.56%
Tier 1 capital (to risk-weighted assets) [1] $ 29,593 $ 26,543
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets [1] 8.00% 8.00%
Tier 1 capital (to adjusted total assets) $ 47,308 $ 48,318
Tier 1 capital (to adjusted total assets) 8.15% 9.96%
Tier 1 capital (to adjusted total assets) [1] $ 25,843 $ 24,253
Tier One Leverage Capital Required to be Well Capitalized to Average Assets [1] 5.00% 5.00%
Minimum Capital Required - Basel III Phase-In Schedule [Member]    
Common equity tier 1 capital (to risk-weighted assets) $ 23,582 $ 19,078
Common equity tier 1 capital (to risk-weighted assets) 6.375% 5.75%
Total risk-based capital (to risk-weighted assets) $ 36,529 $ 30,690
Total risk-based capital (to risk-weighted assets) 9.875% 9.25%
Tier 1 capital (to risk-weighted assets) $ 29,131 $ 24,055
Tier 1 capital (to risk-weighted assets) 7.875% 7.25%
Tier 1 capital (to adjusted total assets) $ 20,674 $ 19,402
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Minimum Capital Required - Basel III Fully Phased-In [Member]    
Common equity tier 1 capital (to risk-weighted assets) $ 25,894 $ 23,225
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%
Total risk-based capital (to risk-weighted assets) $ 38,841 $ 34,838
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 31,443 $ 28,202
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 20,674 $ 19,402
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Hamilton Bank [Member]    
Common equity tier 1 capital (to risk-weighted assets) $ 39,126 $ 40,084
Common equity tier 1 capital (to risk-weighted assets) 10.61% 12.13%
Common equity tier 1 capital (to risk-weighted assets) [1] $ 23,959 $ 21,474
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets [1] 6.50% 6.50%
Total risk-based capital (to risk-weighted assets) $ 41,998 $ 42,334
Total risk-based capital (to risk-weighted assets) 11.39% 12.81%
Total risk-based capital (to risk-weighted assets) [1] $ 36,860 $ 33,037
Capital Required to be Well Capitalized to Risk Weighted Assets [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 39,126 $ 40,084
Tier 1 capital (to risk-weighted assets) 10.61% 12.13%
Tier 1 capital (to risk-weighted assets) [1] $ 29,488 $ 26,429
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets [1] 8.00% 8.00%
Tier 1 capital (to adjusted total assets) $ 39,126 $ 40,084
Tier 1 capital (to adjusted total assets) 7.64% 8.28%
Tier 1 capital (to adjusted total assets) [1] $ 25,621 $ 24,207
Tier One Leverage Capital Required to be Well Capitalized to Average Assets [1] 5.00% 5.00%
Hamilton Bank [Member] | Minimum Capital Required - Basel III Phase-In Schedule [Member]    
Common equity tier 1 capital (to risk-weighted assets) $ 23,498 $ 18,996
Common equity tier 1 capital (to risk-weighted assets) 6.375% 5.75%
Total risk-based capital (to risk-weighted assets) $ 36,399 $ 30,559
Total risk-based capital (to risk-weighted assets) 9.875% 9.25%
Tier 1 capital (to risk-weighted assets) $ 29,027 $ 23,952
Tier 1 capital (to risk-weighted assets) 7.875% 7.25%
Tier 1 capital (to adjusted total assets) $ 20,497 $ 19,365
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Hamilton Bank [Member] | Minimum Capital Required - Basel III Fully Phased-In [Member]    
Common equity tier 1 capital (to risk-weighted assets) $ 25,802 $ 23,126
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%
Total risk-based capital (to risk-weighted assets) $ 38,703 $ 34,689
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 31,331 $ 28,081
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 20,497 $ 19,365
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
[1] Under prompt corrective action