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Disclosure - Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - Roundhouse Electric & Equipment (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-5-acquisitions-and-discontinued-operations-assets-acquired-and-liabilities-assumed-roundhouse-electric-equipment-details Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - Roundhouse Electric & Equipment (Details) Details 51 false false R52.htm 995496 - Disclosure - Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - AAA Advanced Plumbing and Drain (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-5-acquisitions-and-discontinued-operations-assets-acquired-and-liabilities-assumed-aaa-advanced-plumbing-and-drain-details Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - AAA Advanced Plumbing and Drain (Details) Details 52 false false R53.htm 995497 - Disclosure - Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - Southside Plumbing (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-5-acquisitions-and-discontinued-operations-assets-acquired-and-liabilities-assumed-southside-plumbing-details Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - Southside Plumbing (Details) Details 53 false false R54.htm 995498 - Disclosure - Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - Bud's Plumbing (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-5-acquisitions-and-discontinued-operations-assets-acquired-and-liabilities-assumed-buds-plumbing-details Note 5 - Acquisitions and Discontinued Operations - Assets Acquired and Liabilities Assumed - Bud's Plumbing (Details) Details 54 false false R55.htm 995499 - Disclosure - Note 5 - Acquisitions and Discontinued Operations - 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Acquisitions and Discontinued Operations - Financial Information From Discontinued Operations (Details) Details 57 false false R58.htm 995502 - Disclosure - Note 6 - Investments (Details Textual) Sheet http://kingsway-financial.com/20250930/role/statement-note-6-investments-details-textual Note 6 - Investments (Details Textual) Details http://kingsway-financial.com/20250930/role/statement-note-6-investments-tables 58 false false R59.htm 995503 - Disclosure - Note 6 - Investments - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-6-investments-amortized-cost-gross-unrealized-gains-and-losses-and-estimated-fair-value-details Note 6 - Investments - Amortized Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value (Details) Details 59 false false R60.htm 995504 - Disclosure - Note 6 - Investments - Fixed Maturities by Contractual Maturity Periods (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-6-investments-fixed-maturities-by-contractual-maturity-periods-details Note 6 - Investments - Fixed Maturities by Contractual Maturity Periods (Details) Details 60 false false R61.htm 995505 - Disclosure - Note 6 - Investments - Unrealized Loss Position (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-6-investments-unrealized-loss-position-details Note 6 - Investments - Unrealized Loss Position (Details) Details 61 false false R62.htm 995506 - Disclosure - Note 6 - Investments - Net Investment Income (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-6-investments-net-investment-income-details Note 6 - Investments - Net Investment Income (Details) Details 62 false false R63.htm 995507 - Disclosure - Note 6 - Investments - Gross Realized Gains and Losses on Available-for-sale Investments, Limited Liability Investment (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-6-investments-gross-realized-gains-and-losses-on-availableforsale-investments-limited-liability-investment-details Note 6 - Investments - 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Disclosure - Note 12 - Revenue From Contracts With Customers - Deferred Contract Costs (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-12-revenue-from-contracts-with-customers-deferred-contract-costs-details Note 12 - Revenue From Contracts With Customers - Deferred Contract Costs (Details) Details 83 false false R84.htm 995528 - Disclosure - Note 13 - Income Taxes (Details Textual) Sheet http://kingsway-financial.com/20250930/role/statement-note-13-income-taxes-details-textual Note 13 - Income Taxes (Details Textual) Details http://kingsway-financial.com/20250930/role/statement-note-13-income-taxes-tables 84 false false R85.htm 995529 - Disclosure - Note 13 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Sheet http://kingsway-financial.com/20250930/role/statement-note-13-income-taxes-schedule-of-effective-income-tax-rate-reconciliation-details Note 13 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) Details 85 false false R86.htm 995530 - 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