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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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Mar. 31, 2018 | Mar. 31, 2017
Net carrying amount for sales of securities | $ 472,883 | $ 28,073
Net realized loss related to sales of securities | $ 306,851 |
Net realized gain related to sales of securities |  | $ 2,434

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