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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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Amount of cash outflow for settlement of long-term incentive arrangement.

+ References

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The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

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-Topic 718
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