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Note 11 - Regulatory Capital Ratios - Actual and Required Capital Ratios (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Common equity tier 1 capital (to risk-weighted assets), actual amount $ 49,725 $ 48,318
Common equity tier 1 capital (to risk-weighted assets), actual ratio 13.53% 14.56%
Common equity tier 1 capital (to risk-weighted assets), to be well capitalized, amount [1] $ 23,892 $ 21,566
Common equity tier 1 capital (to risk-weighted assets), to be well capitalized, ratio [1] 6.50% 6.50%
Total risk-based capital (to risk-weighted assets), actual amount $ 52,264 $ 50,568
Total risk-based capital (to risk-weighted assets), actual ratio 14.22% 15.24%
Total risk-based capital (to risk-weighted assets), to be well capitalized, amount [1] $ 36,757 $ 33,179
Total risk-based capital (to risk-weighted assets), to be well capitalized, ratio [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets), actual amount $ 49,725 $ 48,318
Tier 1 capital (to risk-weighted assets), actual ratio 13.53% 14.56%
Tier 1 capital (to risk-weighted assets), to be well capitalized, amount [1] $ 29,406 $ 26,543
Tier 1 capital (to risk-weighted assets), to be well capitalized, ratio [1] 8.00% 8.00%
Tier 1 capital (to adjusted total assets), actual amount $ 49,725 $ 48,318
Tier 1 capital (to adjusted total assets), actual ratio 9.96% 9.96%
Tier 1 capital (to adjusted total assets), to be well capitalized, amount [1] $ 24,960 $ 24,253
Tier 1 capital (to adjusted total assets), to be well capitalized, ratio [1] 5.00% 5.00%
Minimum Capital Required - Basel III Phase-In Schedule [Member]    
Common equity tier 1 capital (to risk-weighted assets), minimum capital required, amount $ 21,135 $ 19,078
Common equity tier 1 capital (to risk-weighted assets), minimum capital required, ratio 5.75% 5.75%
Total risk-based capital (to risk-weighted assets), minimum capital required, amount $ 34,000 $ 30,690
Total risk-based capital (to risk-weighted assets), minimum capital required, ratio 9.25% 9.25%
Tier 1 capital (to risk-weighted assets), minimum capital required, amount $ 26,649 $ 24,055
Tier 1 capital (to risk-weighted assets), minimum capital required, ratio 7.25% 7.25%
Tier 1 capital (to adjusted total assets), minimum capital required, amount $ 19,968 $ 19,402
Tier 1 capital (to adjusted total assets), minimum capital required, ratio 4.00% 4.00%
Minimum Capital Required - Basel III Fully Phased-In [Member]    
Common equity tier 1 capital (to risk-weighted assets), minimum capital required, amount $ 25,730 $ 23,225
Common equity tier 1 capital (to risk-weighted assets), minimum capital required, ratio 7.00% 7.00%
Total risk-based capital (to risk-weighted assets), minimum capital required, amount $ 38,595 $ 34,838
Total risk-based capital (to risk-weighted assets), minimum capital required, ratio 10.50% 10.50%
Tier 1 capital (to risk-weighted assets), minimum capital required, amount $ 31,243 $ 28,202
Tier 1 capital (to risk-weighted assets), minimum capital required, ratio 8.50% 8.50%
Tier 1 capital (to adjusted total assets), minimum capital required, amount $ 19,968 $ 19,402
Tier 1 capital (to adjusted total assets), minimum capital required, ratio 4.00% 4.00%
Hamilton Bank [Member]    
Common equity tier 1 capital (to risk-weighted assets), actual amount $ 41,438 $ 40,084
Common equity tier 1 capital (to risk-weighted assets), actual ratio 11.32% 12.13%
Common equity tier 1 capital (to risk-weighted assets), to be well capitalized, amount [1] $ 23,802 $ 21,474
Common equity tier 1 capital (to risk-weighted assets), to be well capitalized, ratio [1] 6.50% 6.50%
Total risk-based capital (to risk-weighted assets), actual amount $ 43,977 $ 42,334
Total risk-based capital (to risk-weighted assets), actual ratio 12.01% 12.81%
Total risk-based capital (to risk-weighted assets), to be well capitalized, amount [1] $ 35,618 $ 33,037
Total risk-based capital (to risk-weighted assets), to be well capitalized, ratio [1] 10.00% 10.00%
Tier 1 capital (to risk-weighted assets), actual amount $ 41,438 $ 40,084
Tier 1 capital (to risk-weighted assets), actual ratio 11.32% 12.13%
Tier 1 capital (to risk-weighted assets), to be well capitalized, amount [1] $ 29,295 $ 26,429
Tier 1 capital (to risk-weighted assets), to be well capitalized, ratio [1] 8.00% 8.00%
Tier 1 capital (to adjusted total assets), actual amount $ 41,438 $ 40,084
Tier 1 capital (to adjusted total assets), actual ratio 8.38% 8.28%
Tier 1 capital (to adjusted total assets), to be well capitalized, amount [1] $ 24,729 $ 24,207
Tier 1 capital (to adjusted total assets), to be well capitalized, ratio [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), minimum capital required, amount $ 21,055 $ 18,996
Common equity tier 1 capital (to risk-weighted assets), minimum capital required, ratio 5.75% 5.75%
Total risk-based capital (to risk-weighted assets), minimum capital required, amount $ 33,872 $ 30,559
Total risk-based capital (to risk-weighted assets), minimum capital required, ratio 9.25% 9.25%
Tier 1 capital (to risk-weighted assets), minimum capital required, amount $ 26,548 $ 23,952
Tier 1 capital (to risk-weighted assets), minimum capital required, ratio 7.25% 7.25%
Tier 1 capital (to adjusted total assets), minimum capital required, amount $ 19,783 $ 19,365
Tier 1 capital (to adjusted total assets), minimum capital required, ratio 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), minimum capital required, amount $ 25,633 $ 23,126
Common equity tier 1 capital (to risk-weighted assets), minimum capital required, ratio 7.00% 7.00%
Total risk-based capital (to risk-weighted assets), minimum capital required, amount $ 38,449 $ 34,689
Total risk-based capital (to risk-weighted assets), minimum capital required, ratio 10.50% 10.50%
Tier 1 capital (to risk-weighted assets), minimum capital required, amount $ 31,125 $ 28,081
Tier 1 capital (to risk-weighted assets), minimum capital required, ratio 8.50% 8.50%
Tier 1 capital (to adjusted total assets), minimum capital required, amount $ 19,783 $ 19,365
Tier 1 capital (to adjusted total assets), minimum capital required, ratio 4.00% 4.00%
[1] Under prompt corrective action