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Note 20 - Contingencies (Details Textual) $ in Thousands, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2019 USD ($) shares | May 31, 2019 CAD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares
Deferred Compensation Arrangement with Individual, Compensation Expense | $ | $ 314,379 |  |  | $ 314,379
Payments for Settlement of LTIA | $ 62,900 | $ 84.3 |  |
Common Stock [Member] |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) |  |  |  | 2,918,860
Common Stock [Member] | Subordinate Voting Shares [Member] |  |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total (in shares) | 2,918,860 | 2,918,860 |  |

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