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Note 4 - Insurance SPAC Investments and Other Significant Events (Details Textual) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 11 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 22, 2020 USD ($) $ / shares shares | Dec. 21, 2020 shares | Nov. 24, 2020 $ / shares shares | Oct. 15, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Feb. 03, 2020 USD ($) | Dec. 30, 2019 USD ($) $ / shares shares | Mar. 22, 2019 shares | Dec. 31, 2020 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Nov. 24, 2020 $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 22, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) shares | Sep. 25, 2020 USD ($) | Jan. 31, 2020 USD ($) | Dec. 29, 2019 | Dec. 31, 2017 USD ($) shares | Sep. 29, 2017 USD ($) | Sep. 01, 2017 $ / shares | Aug. 31, 2017 $ / shares | Oct. 03, 2016 USD ($)
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |  | $ 0.01 |  |  |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  |  |  |  | $ 0.01 | $ 0.001 |
Other Investments, Total |  |  |  |  |  |  |  |  |  | $ 21,878,000 |  |  |  | $ 14,315,000 |  |  |  |  |  |  | $ 21,878,000 |  | $ 14,315,000 |  |  |  |  |  |  |  |  |
Other Investment Sold, Not yet Purchased |  |  |  |  |  |  |  |  |  | 7,415,000 |  |  |  |  |  |  |  |  |  |  | 7,415,000 |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance |  |  |  |  |  |  |  |  |  | 101,437,000 |  |  |  | 48,756,000 |  |  |  |  |  |  | 101,437,000 |  | 48,756,000 | $ 42,438,000 |  |  |  | $ 48,156,000 |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  | 13,482,000 |  |  |  | 3,799,000 |  |  |  |  |  |  | 13,482,000 |  | 3,799,000 |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance |  |  |  |  |  |  |  |  |  | $ 57,528,000 |  |  |  | $ 15,437,000 |  |  |  |  |  |  | $ 57,528,000 |  | $ 15,437,000 | $ 6,664,000 |  |  |  | $ 8,284,000 |  |  |  |
Common Stock, Shares, Issued, Total (in shares) | shares |  |  |  |  |  |  |  |  |  | 1,325,529 |  |  |  | 1,193,624 |  |  |  |  |  |  | 1,325,529 |  | 1,193,624 |  |  |  |  |  |  |  |  |
Common Unit, Outstanding (in shares) | shares |  |  |  |  |  |  |  |  |  | 38,418,255 |  |  |  | 38,952,715 |  |  |  |  |  |  | 38,418,255 |  | 38,952,715 | 16,431,254 |  |  |  | 16,934,944 |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,883,000 |  |  |  |  |  |  |  | $ 7,883,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,166,000 |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  |  |  |  | 47,100,000 |  |  |  | 48,861,000 |  |  |  |  |  |  | 47,100,000 |  | 48,861,000 |  |  |  |  |  |  |  |  |
Redeemable Financial Instruments |  |  |  |  |  |  |  |  |  | 11,957,000 |  |  |  | 16,983,000 |  |  |  |  |  |  | 11,957,000 |  | 16,983,000 |  |  |  |  |  |  |  |  |
Alternative Investment |  |  |  |  |  |  |  |  |  | 2,548 |  |  |  | 2,891,000 |  |  |  |  |  |  | 2,548 |  | 2,891,000 |  |  |  |  |  |  |  |  |
ViaNova [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Investment Not Readily Marketable, Quoted Value |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |  |  |  |  |  |
Other Investment Not Readily Marketable, Fair Value |  |  |  |  |  |  |  |  |  | 2,243,000 |  |  |  |  |  |  |  |  |  |  | 2,243,000 |  |  |  |  |  |  |  |  |  |  |
JKD Capital Partners I, LTD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Financial Instruments |  |  |  |  |  |  |  |  |  | $ 7,957,000 |  |  |  | 7,957,000 |  |  |  |  |  |  | $ 7,957,000 |  | 7,957,000 |  |  |  |  |  |  |  |  |
JKD Capital Partners I, LTD [Member] | Investment Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,000,000
CBF [Member] | Investment Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Financial Instruments |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,500,000 |  |  |  | $ 8,000,000 |  |  |
Payments for Redeemable Financial Instruments |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Agreement, Percentage of Investment Return on Investment Amount for Revenues Greater than Zero |  |  |  |  | 20.00% |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |
Investment Agreement, Percentage of Investment Return on Business Revenue for Revenues Greater than Zero |  |  |  |  | 9.40% |  |  |  |  | 15.20% |  |  |  |  |  |  |  |  |  |  | 15.20% |  |  |  |  |  |  |  |  |  |  |
Investment Agreement, Percentage of Investment Return on Investment Amount for Revenues with Zero or Less than Zero |  |  |  |  | 3.75% |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |  |  |  |  |  |  |  |
CBF [Member] | Investment Agreement [Member] | Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for Redeemable Financial Instruments | $ 4,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DGC Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Financial Instruments |  |  |  |  |  | $ 2,000,000 |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
DGC Trust [Member] | Investment Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |  | $ 2,000,000 |  |  |
Payments for Redeemable Financial Instruments |  |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Daniel G. Cohen And DGC Trust [Member] | IMXI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative Investment |  |  |  |  |  |  |  | $ 7,779,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paycheck Protection Program CARES Act [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,166,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-convertible Senior Notes 12.00% (2020 Senior Notes) [Member] | Non-convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-convertible Senior Notes 12.00% (2020 Senior Notes) [Member] | JKD Capital Partners I, LTD [Member] | Non-convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,250,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |
Non-convertible Senior Notes 12.00% (2020 Senior Notes) [Member] | JKD Capital Partners I LTD and RN Capital Solutions LLC [Member] | Non-convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,500,000 |  |  |  |  |  |
The 2019 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 4,386,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  | $ 2,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
COVID-19 Pandemic [Member] | JVB Holdings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,883,000 |  | $ 7,883,000 |  |  |  |  |  |  |  |  |  |  |
SPAC II Sponsor Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  | $ 4,064,000 |  |  |  |  |  |  |  |  |  |  | 4,064,000 |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance |  |  |  |  |  |  |  |  |  | 4,295,000 |  |  |  |  |  |  |  |  |  |  | 4,295,000 |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity, Total |  |  |  |  |  |  |  |  |  | (231,000) |  |  |  |  |  |  |  |  |  |  | (231,000) |  |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Total |  |  |  |  |  |  |  |  |  | 325,000 |  |  |  |  |  |  |  |  |  |  | 325,000 |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  | 5,741,000 |  |  |  |  |  |  |  |  |  |  | 5,741,000 |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance |  |  |  |  |  |  |  |  |  | 5,416,000 |  |  |  |  |  |  |  |  |  |  | 5,416,000 |  |  |  |  |  |  |  |  |  |  |
CK Capital Partners B.V. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  | $ 296,000 |  |  |  | $ 18,000 |  |  |  |  |  |  | $ 296,000 |  | $ 18,000 |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |  |  |  | 45.00% |  |  |  |  |  |  |  |  |
Equity Method Investment, Quoted Market Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  |
CK Capital Partners B.V. [Member] | Daniel G. Cohen [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Quoted Market Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17,000 |  |  |  |  |  |  |  |  | $ 17,000 |  |  |  |  |  |  |  |  |
SPA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic Interest, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28.75% |  |  |  |  |  |  |  |  |  |  |
COHN, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic Interest, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28.75% |  |  |  |  |  |  |  |  |  |  |
Voting Interest, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  | 72.96% |  |  |  | 71.25% |  |  |  |  |  |  | 72.96% |  | 71.25% | 32.40% |  |  | 32.22% |  |  |  |  |
SFT Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  |  |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
AOI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Equity Method Investment, Quoted Market Value |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |  |  |
Equity Method Investment, Aggregate Cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 558,000 |  |  |  |  |  |  |  |  | $ 558,000 |  |  |  |  |  |  |  |  |
Sponsor Entities [Member] | Private Placement [Member] | Insurance SPAC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Placement Units Purchased (in shares) | shares |  |  |  |  |  |  |  |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsor Entities [Member] | SFT Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  |  |  |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsor Entities [Member] | SFT Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  |  |  |  | 187,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  | $ 11.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sponsor Entities [Member] | Sponsor Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  |  |  |  | 4,497,525 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating LLC [Member] | SFT [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Investments, Total |  |  |  |  |  |  |  |  |  | $ 36,395,000 |  |  |  |  |  |  |  |  |  |  | $ 36,395,000 |  |  |  |  |  |  |  |  |  |  |
Other Investment Sold, Not yet Purchased |  |  |  |  |  |  |  |  |  | 1,337,000 |  |  |  |  |  |  |  |  |  |  | 1,337,000 |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance |  |  |  |  |  |  |  |  |  | $ 16,686,000 |  |  |  |  |  |  |  |  |  |  | $ 16,686,000 |  |  |  |  |  |  |  |  |  |  |
Operating LLC [Member] | INSU Pipe LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Parent's Wholly Owned Subsidiary, Securities to be Distributed (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 350,000 |  |  |  |  |  |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Operating LLC [Member] | Private Placement [Member] | Insurance SPAC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Placement Units Purchased (in shares) | shares |  |  |  |  |  |  |  |  | 122,665 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating LLC [Member] | Sponsor Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  |  |  |  | 2,019,721 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating LLC [Member] | Shift [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, Total |  |  |  |  |  |  |  |  |  | $ 18,372,000 |  |  |  |  |  |  |  |  |  |  | $ 18,372,000 |  |  |  |  |  |  |  |  |  |  |
Company's Subsidiary [Member] | SFT Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Parent's Wholly Owned Subsidiary, Securities to be Distributed (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Units, New Issues (in shares) | shares |  |  |  | 452,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | Founder Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Units, New Issues (in shares) | shares |  |  |  | 6,669,667 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  |  |  | $ 11.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.50 |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Shares Per Unit (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Warrants Per Unit (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.33 |  |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | Sponsor Shares [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock, Vested (in shares) | shares |  |  |  | 765,833 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 765,833 |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock, Available to Vest (in shares) | shares |  |  |  | 1,244,479 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,244,479 |  |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | Sponsor Shares [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock, Available to Vest (in shares) | shares |  |  |  | 1,244,479 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,244,479 |  |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | Founder Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock, Vested (in shares) | shares |  |  |  | 1,569,333 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,569,333 |  |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | Founder Shares [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock, Available to Vest (in shares) | shares |  |  |  | 2,550,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,550,167 |  |  |  |  |  |  |  |  |  |  |  |
SPAC II [Member] | Founder Shares [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Stock, Available to Vest (in shares) | shares |  |  |  | 2,550,167 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,550,167 |  |  |  |  |  |  |  |  |  |  |  |
MetroMile [Member] | Share-based Payment Arrangement, Tranche One [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trigger Share Price For Share Vesting (in dollars per share) | $ / shares |  |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |
MetroMile [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trigger Share Price For Share Vesting (in dollars per share) | $ / shares |  |  |  | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17 |  |  |  |  |  |  |  |  |  |  |  |
MetroMile [Member] | Sponsor Shares [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trigger Share Price For Share Vesting (in dollars per share) | $ / shares |  |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in shares) | shares |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option Period On Additional Units To Be Purchased (Day) |  | 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issuable, Option (in shares) | shares |  | 3,270,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,270,000 |  |  |  |  |  |  |  |  |  |
Common Stock, Shares, Issued, Total (in shares) | shares |  | 34,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,100,000 |  |  |  |  |  |  |  |  |  |
Common Unit, Outstanding (in shares) | shares |  | 34,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,100,000 |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 71,000 |  |  |  |  |  |  |  |  |  |  |
Commitments, Operating and Acquisition Expenses |  |  |  |  |  |  |  |  |  | $ 810,000 |  |  |  |  |  |  |  |  |  |  | $ 810,000 |  |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] | Insurance SPAC Warrant III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  | $ 11.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11.50 |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Warrants Per Unit (in shares) | shares |  | 0.33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0001 |  |  |  |  |  |  |  |  |  |
Units Issued During Period, Shares Per Unit (in shares) | shares |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in shares) | shares |  | 575,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  | $ 5,750,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance of Units, Trust Account |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |
Payments of Equity Issuance Costs, Trust Account |  | $ 10,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Public Shares Redeemed |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in shares) | shares |  | 3,200,000 | 3,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Insurance SPAC III Sponsor Entities [Member] | Founder Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares (in shares) | shares |  | 8,525,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,525,000 |  |  |  |  |  |  |  |  |  |
Founder Shares, Percent of Shares to Become Transferable or Salable Upon Consummation of Business Combination |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Closing Share Price for Founder Shares to Become Transferable or Salable, Tranche One (in dollars per share) | $ / shares |  | $ 12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 |  |  |  |  |  |  |  |  |  |
Closing Share Price for Founder Shares to Become Transferable or Salable, Tranche Two (in dollars per share) | $ / shares |  | 13.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13.50 |  |  |  |  |  |  |  |  |  |
Closing Share Price for Founder Shares to Become Transferable or Salable, Tranche Three (in dollars per share) | $ / shares |  | $ 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17 |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Shares Purchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,467,500 |  |  |  |  |  |  |  |  |  |
Insurance SPAC [Member] | Insurance SPAC Warrant III [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance of Units |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Other Investments Equity Security [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in shares) | shares |  |  |  |  |  |  |  | 662,361 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Unrestricted Shares Issued in Transaction (in shares) | shares |  |  |  |  |  |  |  | 134,317 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Restricted Shares Issued in Transaction (in shares) | shares |  |  |  |  |  |  |  | 528,044 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Other Investments Equity Security [Member] | Closing Price Tranche 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Restricted Shares Becoming Tradeable, Issued in Transaction (in shares) | shares |  |  |  |  |  |  |  | 264,021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period Out Of Consecutive 30 Trading Days For Transferable Or Salable Price Tranches To Hit (Year) |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Other Investments Equity Security [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Number of Restricted Shares Becoming Tradeable, Issued in Transaction (in shares) | shares |  |  |  |  |  |  |  | 264,023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of Stock, Price Per Share (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period Out Of Consecutive 30 Trading Days For Transferable Or Salable Price Tranches To Hit (Year) |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
COHN, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 11.89 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Membership Units Received, Net Of Surrenders (in shares) | shares |  |  |  |  |  |  |  | 22,429,541 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Share Exchange Ratio |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Amount Of Shares (in shares) | shares |  |  |  |  |  |  |  | 2,242,954 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
COHN, LLC [Member] | Daniel G. Cohen And DGC Trust [Member] | IMXI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Membership Units Received, Net Of Surrenders (in shares) | shares |  |  |  |  |  |  |  | 22,429,541 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Share Exchange Ratio |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Amount Of Shares (in shares) | shares |  |  |  |  |  |  |  | 2,242,954 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
SPA [Member] | SPA [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  | 67.80% |  |  |  |  |  |  |  |  |  |  | 67.80% |  |  |  |  |  |  |  |  |  |  |

X
- Definition Represents the closing share price for founder shares to become transferable or salable, tranche one. + References No definition available. + Details
Name: | cohn_ClosingSharePriceForFounderSharesToBecomeTransferableOrSalableTrancheOne
Namespace Prefix: | cohn_
Data Type: | num:perShareItemType
Balance Type: | na
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