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Note 15 - Regulatory Capital Ratios - Capital Ratios and Minimum Capital Requirements of Bank (Details) - USD ($)
Mar. 31, 2017
Mar. 31, 2016
Common equity tier 1 capital (to risk-weighted assets) $ 21,566 $ 15,298
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%
Total risk-based capital (to risk-weighted assets) $ 50,568 $ 56,203
Total risk-based capital (to risk-weighted assets) 15.24% 23.88%
Total risk-based capital (to risk-weighted assets) $ 33,179 $ 23,535
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 48,318 $ 54,459
Tier 1 capital (to risk-weighted assets) 14.56% 23.14%
Tier 1 capital (to risk-weighted assets) $ 26,543 $ 18,828
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Tier 1 capital (to adjusted total assets) $ 48,318 $ 54,459
Tier 1 capital (to adjusted total assets) 9.96% 14.23%
Tier 1 capital (to adjusted total assets) $ 24,253 $ 19,140
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Common equity tier 1 capital (to risk-weighted assets) $ 48,318 $ 54,459
Common equity tier 1 capital (to risk-weighted assets) 14.56% 23.14%
Minimum Capital Required - Basel III Phase-In Schedule [Member]    
Total risk-based capital (to risk-weighted assets) $ 30,690 $ 20,299
Total risk-based capital (to risk-weighted assets) 9.25% 8.625%
Tier 1 capital (to risk-weighted assets) $ 24,055 $ 15,592
Tier 1 capital (to risk-weighted assets) 7.25% 6.625%
Tier 1 capital (to adjusted total assets) $ 19,402 $ 15,312
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 19,078 $ 12,062
Common equity tier 1 capital (to risk-weighted assets) 5.75% 5.125%
Minimum Capital Required - Basel III Fully Phased-In [Member]    
Total risk-based capital (to risk-weighted assets) $ 34,838 $ 24,712
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 28,202 $ 20,005
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 19,402 $ 15,312
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 23,225 $ 16,475
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%
Hamilton Bank [Member]    
Common equity tier 1 capital (to risk-weighted assets) $ 21,474 $ 15,182
Common Equity Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.50% 6.50%
Total risk-based capital (to risk-weighted assets) $ 42,334 $ 46,262
Total risk-based capital (to risk-weighted assets) 12.81% 19.81%
Total risk-based capital (to risk-weighted assets) $ 33,037 $ 23,357
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 40,084 $ 44,518
Tier 1 capital (to risk-weighted assets) 12.13% 19.06%
Tier 1 capital (to risk-weighted assets) $ 26,429 $ 18,686
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Tier 1 capital (to adjusted total assets) $ 40,084 $ 44,518
Tier 1 capital (to adjusted total assets) 8.28% 11.78%
Tier 1 capital (to adjusted total assets) $ 24,207 $ 18,892
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Common equity tier 1 capital (to risk-weighted assets) $ 40,084 $ 44,518
Common equity tier 1 capital (to risk-weighted assets) 12.13% 19.06%
Hamilton Bank [Member] | Minimum Capital Required - Basel III Phase-In Schedule [Member]    
Total risk-based capital (to risk-weighted assets) $ 30,559 $ 20,146
Total risk-based capital (to risk-weighted assets) 9.25% 8.625%
Tier 1 capital (to risk-weighted assets) $ 23,952 $ 15,474
Tier 1 capital (to risk-weighted assets) 7.25% 6.625%
Tier 1 capital (to adjusted total assets) $ 19,365 $ 15,114
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 18,996 $ 11,971
Common equity tier 1 capital (to risk-weighted assets) 5.75% 5.125%
Hamilton Bank [Member] | Minimum Capital Required - Basel III Fully Phased-In [Member]    
Total risk-based capital (to risk-weighted assets) $ 34,689 $ 24,525
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 28,081 $ 19,854
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 19,365 $ 15,114
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 23,126 $ 16,350
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%