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Note 10 - Regulatory Capital Ratios - Capital Ratios and Minimum Capital Requirements of Bank (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Common equity tier 1 capital (to risk-weighted assets) $ 49,116 $ 47,308
Common equity tier 1 capital (to risk-weighted assets) 13.89% 12.79%
Common equity tier 1 capital (to risk-weighted assets) [1] $ 22,979 $ 24,044
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) $ 52,199 $ 50,180
Total risk-based capital (to risk-weighted assets) 14.77% 13.57%
Total risk-based capital (to risk-weighted assets) [1] $ 35,352 $ 36,992
Capital Required to be Well Capitalized to Risk Weighted Assets [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 49,116 $ 47,308
Tier 1 capital (to risk-weighted assets) 13.89% 12.79%
Tier 1 capital (to risk-weighted assets) [1] $ 28,282 $ 29,593
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) $ 49,116 $ 47,308
Tier 1 capital (to adjusted total assets) 9.62% 9.15%
Tier 1 capital (to adjusted total assets) [1] $ 25,519 $ 25,843
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) $ 22,537 $ 23,582
Common equity tier 1 capital (to risk-weighted assets) 6.375% 6.375%
Total risk-based capital (to risk-weighted assets) $ 34,910 $ 36,529
Total risk-based capital (to risk-weighted assets) 9.875% 9.875%
Tier 1 capital (to risk-weighted assets) $ 27,840 $ 29,131
Tier 1 capital (to risk-weighted assets) 7.875% 7.875%
Tier 1 capital (to adjusted total assets) $ 20,415 $ 20,674
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) $ 24,747 $ 25,894
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%
Total risk-based capital (to risk-weighted assets) $ 37,120 $ 38,841
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 30,049 $ 31,443
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 20,415 $ 20,674
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Hamilton Bank [Member]    
Common equity tier 1 capital (to risk-weighted assets) $ 42,984 $ 39,126
Common equity tier 1 capital (to risk-weighted assets) 12.20% 10.61%
Common equity tier 1 capital (to risk-weighted assets) [1] $ 22,910 $ 23,959
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) $ 46,067 $ 41,998
Total risk-based capital (to risk-weighted assets) 13.07% 11.39%
Total risk-based capital (to risk-weighted assets) [1] $ 35,245 $ 36,860
Capital Required to be Well Capitalized to Risk Weighted Assets [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 42,984 $ 39,126
Tier 1 capital (to risk-weighted assets) 12.20% 10.61%
Tier 1 capital (to risk-weighted assets) [1] $ 28,196 $ 29,488
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) $ 42,984 $ 39,126
Tier 1 capital (to adjusted total assets) 8.61% 7.64%
Tier 1 capital (to adjusted total assets) [1] $ 24,952 $ 25,621
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) $ 22,469 $ 23,498
Common equity tier 1 capital (to risk-weighted assets) 6.375% 6.375%
Total risk-based capital (to risk-weighted assets) $ 34,805 $ 36,399
Total risk-based capital (to risk-weighted assets) 9.875% 9.875%
Tier 1 capital (to risk-weighted assets) $ 27,756 $ 29,027
Tier 1 capital (to risk-weighted assets) 7.875% 7.875%
Tier 1 capital (to adjusted total assets) $ 19,962 $ 20,497
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) $ 24,672 $ 25,802
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%
Total risk-based capital (to risk-weighted assets) $ 37,008 $ 38,703
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 29,959 $ 31,331
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 19,962 $ 20,497
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
[1] Under prompt corrective action