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3) Investments: Net carrying amount of held to maturity securities (Details) - Held-to-maturity Securities - USD ($) | 3 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Net carrying amount for sales of securities | $ 1,789,159 | $ 2,543,312
Net realized gain related to sales of securities | $ 156,171 | $ 330,373

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- Definition Represents the monetary amount of Net carrying amount for sales of securities, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the monetary amount of Net realized gain related to sales of securities, during the indicated time period. + References No definition available. + Details
Name: | fil_NetRealizedGainRelatedToSalesOfSecurities
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_GainLossOnInvestmentsByCategoryAxis=us-gaap_HeldtomaturitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |