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Note 11 - Regulatory Capital Ratios - Capital Ratios and Minimum Capital Requirements of Bank (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Common equity tier 1 capital (to risk-weighted assets) [1] $ 22,211 $ 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) $ 51,363 $ 50,568
Total risk-based capital (to risk-weighted assets) 15.03% 15.24%
Total risk-based capital (to risk-weighted assets) [1] $ 34,171 $ 33,179
Capital Required to be Well Capitalized to Risk Weighted Assets [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 48,942 $ 48,318
Tier 1 capital (to risk-weighted assets) 14.32% 14.56%
Tier 1 capital (to risk-weighted assets) [1] $ 27,337 $ 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) $ 48,942 $ 48,318
Tier 1 capital (to adjusted total assets) 9.82% 9.96%
Tier 1 capital (to adjusted total assets) [1] $ 24,908 $ 24,253
Tier One Leverage Capital Required to be Well Capitalized to Average Assets [1] 5.00% 5.00%
Common equity tier 1 capital (to risk-weighted assets) $ 48,942 $ 48,318
Common equity tier 1 capital (to risk-weighted assets) 14.32% 14.56%
Minimum Capital Required - Basel III Phase-In Schedule [Member]    
Common equity tier 1 capital (to risk-weighted assets) 5.75% 5.75%
Total risk-based capital (to risk-weighted assets) $ 31,608 $ 30,690
Total risk-based capital (to risk-weighted assets) 9.25% 9.25%
Tier 1 capital (to risk-weighted assets) $ 24,774 $ 24,055
Tier 1 capital (to risk-weighted assets) 7.25% 7.25%
Tier 1 capital (to adjusted total assets) $ 19,926 $ 19,402
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 19,648 $ 19,078
Minimum Capital Required - Basel III Fully Phased-In [Member]    
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%
Total risk-based capital (to risk-weighted assets) $ 35,880 $ 34,838
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 29,046 $ 28,202
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 19,926 $ 19,402
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 23,920 $ 23,225
Hamilton Bank [Member]    
Common equity tier 1 capital (to risk-weighted assets) [1] $ 22,120 $ 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) $ 43,142 $ 42,334
Total risk-based capital (to risk-weighted assets) 12.68% 12.81%
Total risk-based capital (to risk-weighted assets) [1] $ 34,031 $ 33,037
Capital Required to be Well Capitalized to Risk Weighted Assets [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 40,722 $ 40,084
Tier 1 capital (to risk-weighted assets) 11.97% 12.13%
Tier 1 capital (to risk-weighted assets) [1] $ 27,225 $ 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) $ 40,722 $ 40,084
Tier 1 capital (to adjusted total assets) 8.25% 8.28%
Tier 1 capital (to adjusted total assets) [1] $ 24,682 $ 24,207
Tier One Leverage Capital Required to be Well Capitalized to Average Assets [1] 5.00% 5.00%
Common equity tier 1 capital (to risk-weighted assets) $ 40,722 $ 40,084
Common equity tier 1 capital (to risk-weighted assets) 11.97% 12.13%
Hamilton Bank [Member] | Minimum Capital Required - Basel III Phase-In Schedule [Member]    
Common equity tier 1 capital (to risk-weighted assets) 5.75% 5.75%
Total risk-based capital (to risk-weighted assets) $ 31,479 $ 30,559
Total risk-based capital (to risk-weighted assets) 9.25% 9.25%
Tier 1 capital (to risk-weighted assets) $ 24,673 $ 23,952
Tier 1 capital (to risk-weighted assets) 7.25% 7.25%
Tier 1 capital (to adjusted total assets) $ 19,745 $ 19,365
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 19,568 $ 18,996
Hamilton Bank [Member] | Minimum Capital Required - Basel III Fully Phased-In [Member]    
Common equity tier 1 capital (to risk-weighted assets) 7.00% 7.00%
Total risk-based capital (to risk-weighted assets) $ 35,733 $ 34,689
Total risk-based capital (to risk-weighted assets) 10.50% 10.50%
Tier 1 capital (to risk-weighted assets) $ 28,926 $ 28,081
Tier 1 capital (to risk-weighted assets) 8.50% 8.50%
Tier 1 capital (to adjusted total assets) $ 19,745 $ 19,365
Tier 1 capital (to adjusted total assets) 4.00% 4.00%
Common equity tier 1 capital (to risk-weighted assets) $ 23,822 $ 23,126
[1] Under prompt corrective action