Note 5 - Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Long-term debt	$ 606,746	$ 608,591
Less: Current portion	(6,883)	(7,031)
Long-term debt	599,863	601,560
First Lien Credit Facilities [Member] | Term Loan [Member]
Long-term debt	518,146	520,499
First Lien Credit Facilities [Member] | Incremental Term Loans [Member]
Long-term debt	87,522	86,710
Equipment Long-term Note Payable and Finance Leases [Member]
Long-term debt	$ 1,078	$ 1,382