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Disclosure - Note 9 - Goodwill and Intangible Assets - Change in Goodwill (Details) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-9-goodwill-and-intangible-assets-change-in-goodwill-details Note 9 - Goodwill and Intangible Assets - Change in Goodwill (Details) Details 74 false false R75.htm 074 - Disclosure - Note 9 - Goodwill and Intangible Assets - Intangible Assets (Details) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-9-goodwill-and-intangible-assets-intangible-assets-details Note 9 - Goodwill and Intangible Assets - Intangible Assets (Details) Details 75 false false R76.htm 075 - Disclosure - Note 10 - Leases - Present Information About Leases (Details) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-10-leases-present-information-about-leases-details Note 10 - Leases - Present Information About Leases (Details) Details 76 false false R77.htm 076 - Disclosure - Note 10 - Lease - Maturity Schedule of Undiscounted Cash flow (Details) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-10-lease-maturity-schedule-of-undiscounted-cash-flow-details Note 10 - Lease - Maturity Schedule of Undiscounted Cash flow (Details) Details 77 false false R78.htm 077 - Disclosure - Note 11 - Deposits (Details Textual) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-11-deposits-details-textual Note 11 - Deposits (Details Textual) Details http://www.skylinenationalbank.bank/20191231/role/statement-note-11-deposits-tables 78 false false R79.htm 078 - Disclosure - Note 11 - Deposits - Scheduled Maturities of Time Deposits (Details) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-11-deposits-scheduled-maturities-of-time-deposits-details Note 11 - Deposits - Scheduled Maturities of Time Deposits (Details) Details 79 false false R80.htm 079 - Disclosure - Note 12 - Short-term Debt (Details Textual) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-12-shortterm-debt-details-textual Note 12 - Short-term Debt (Details Textual) Details http://www.skylinenationalbank.bank/20191231/role/statement-note-12-shortterm-debt- 80 false false R81.htm 080 - Disclosure - Note 13 - Long-term Debt (Details Textual) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-13-longterm-debt-details-textual Note 13 - Long-term Debt (Details Textual) Details http://www.skylinenationalbank.bank/20191231/role/statement-note-13-longterm-debt- 81 false false R82.htm 081 - Disclosure - Note 14 - Financial Instruments (Details Textual) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-14-financial-instruments-details-textual Note 14 - Financial Instruments (Details Textual) Details http://www.skylinenationalbank.bank/20191231/role/statement-note-14-financial-instruments-tables 82 false false R83.htm 082 - Disclosure - Note 14 - Financial Instruments - Financial Instruments (Details) Sheet http://www.skylinenationalbank.bank/20191231/role/statement-note-14-financial-instruments-financial-instruments-details Note 14 - Financial Instruments - Financial Instruments (Details) Details 83 false false R84.htm 083 - Disclosure - 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