Note 15 - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 169,678	$ 173,202
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	(2,000)	(1,300)
Deferred Income Tax Liabilities, Net, Total	28,553	27,555
Deferred Tax Liabilities, Expiration Of Operating Loss Carryforwards	8,200	7,600
Deferred Tax Liabilities, Land and Indefinite Lived Intangible Assets	23,800	21,900
Deferred Tax Asset, Interest Carryforward	3,300	1,300
Deferred Tax Assets, State Taxes	500	600
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	400	0
Operating Loss Carryforwards, Total	824,400
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	2,800	(200)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount, Total	(2,811)	244
Unrecognized Tax Benefits, Ending Balance	65	1,381	$ 1,381
Income Tax Examination, Penalties and Interest Expense, Total	1,500	200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	100	1,600
PWI [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	3,300
Ravix [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	800
CMC [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	500
CMC Acquisition LLC [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		500
Domestic Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance, Total	169,700	173,200
Operating Loss Carryforwards, Total	$ 10,100
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Open Tax Year	2018 2019 2020 2021
Foreign Tax Authority [Member]
Deferred Tax Assets, Valuation Allowance, Total	$ 100	$ 100
Operating Loss Carryforwards, Total	$ 500
Foreign Tax Authority [Member] | Canada Revenue Agency [Member]
Open Tax Year	2017 2018 2019 2020 2021