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Note 8 - Deposits - Public Entity Deposits (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Collateralized by investment securities | $ 10,863,081 | $ 10,019,425
U.S. govt. sponsored agency securities |  |
Collateralized by investment securities | 980,160 | 983,670
Residential Mortgage Backed Securities |  |
Collateralized by investment securities | $ 9,882,921 | $ 9,035,755

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- Definition Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |