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Note 21 - Subsequent events (Details Textual) $ / shares in Units, $ in Millions | Mar. 14, 2023 USD ($) | Jan. 30, 2023 USD ($) $ / shares shares | Dec. 30, 2023 | Sep. 30, 2023 | Sep. 23, 2023 | Feb. 10, 2023 USD ($) | Feb. 09, 2023 USD ($) | Aug. 08, 2022 | Feb. 11, 2022 | Oct. 26, 2021 USD ($) | Jun. 14, 2019 USD ($)
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Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] |  |  |  |  |  |  |  |  |  |  |
Total Funded Debt to EBITDA Ratio |  |  |  |  |  |  |  |  | 2 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 240.0 | $ 180.0
Maximum Total Funded Debt to EBITDA Ratio |  |  |  | 3.75 |  |  |  | 4.00 |  |  |
Minimum Fixed Charge Coverage Ratio |  |  |  |  |  |  |  | 3.00 |  |  |
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | Restated Senior Secured Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  | $ 240.0 |
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | Accordion Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  | $ 60.0
Subsequent Event [Member] | Series A Preferred Units [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Units, Issued (in shares) | shares |  | 5,000,000 |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ / shares |  | $ 6.00 |  |  |  |  |  |  |  |  |
Unit Purchase Agreement, Milestone Method, Additional Revenue |  | $ 30.0 |  |  |  |  |  |  |  |  |
Unit Purchase Agreement, Milestone Method, Future Capital Commitment |  | $ 82.5 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] |  |  |  |  |  |  |  |  |  |  |
Maximum Total Funded Debt to EBITDA Ratio |  |  | 3.75 | 4.00 | 4.50 |  |  |  |  |  |
Minimum Fixed Charge Coverage Ratio | 3.00 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Periodic Payment | $ 2.8 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | Accordion Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Suspended Amount | $ 60.0 |  |  |  |  |  |  |  |  |  |
Stock Buyback Program 2023 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 40.0 | $ 40.0 |  |  |  |

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