Note 13 - Long-term Debt (Details Textual)			1 Months Ended	3 Months Ended				6 Months Ended		9 Months Ended
		Mar. 28, 2019 USD ($)	Apr. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2022	Dec. 31, 2021 USD ($)	Sep. 30, 2021	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017	Nov. 30, 2017 USD ($)
Long-term Debt, Current Maturities, Total	[1]			$ 31,395,000				$ 31,395,000						$ 33,731,000
Assets, Total				2,557,931,000		$ 2,566,132,000		2,557,931,000	$ 2,566,132,000					2,523,366,000
Net Income (Loss) Attributable to Parent, Total				4,172,000		(17,983,000)		30,576,000	(15,616,000)
Gain (Loss) on Extinguishment of Debt, Total				106,000		(0)		789,000	16,833,000
Debt Instrument, Collateral Amount				2,451,000				2,451,000						2,813,000
Derivative Liability, Current				1,749,000				1,749,000						2,834,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Total				391,000	$ 414,000	(12,000)	$ (2,773,000)	805,000	(2,785,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax				(135,000)	$ (144,000)	4,000	$ 933,000	(279,000)	937,000
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax				(555,000)		(434,000)		(1,087,000)	(430,000)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred								1,369,000
Non-Guarantor Subsidiaries [Member]
Assets, Total				100,209,000				100,209,000						123,468,000
Accounts Receivable, after Allowance for Credit Loss, Total				99,716,000				99,716,000						122,639,000
Net Income (Loss) Attributable to Parent, Total				$ (3,284,000)		$ 312,000		(2,125,000)	1,359,000
Forecast [Member]
Derivative, Notional Amount												$ 150,000,000
Senior Secured Second Lien Notes due 2025 [Member]
Repayments of Debt								$ 14,153,000	$ 25,480,000
PEDFA Solid Waste Disposal Revenue Bonds [Member]
Debt Instrument, Interest Rate, Stated Percentage			9.00%	9.00%				9.00%
Debt Instrument, Face Amount			$ 75,000,000
Debt Instrument, Term (Year)			7 years
Proceeds from Issuance of Debt			$ 75,000,000
Proceeds from Reimbursements from Qualified Expenses				$ 21,464,000
Restricted Cash, Total			$ 53,536,000
Revolving Credit Facility [Member]
Long-term Line of Credit, Total														0
Loans Payable [Member] | The TLA Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																	$ 100,000,000
Loans Payable [Member] | Senior Secured Second Lien Notes due 2025 [Member]
Debt Instrument, Covenant, Maximum Amount of Letters of Credit								$ 200,000
Debt Instrument, Covenant, Net Leverage Ratio, Maximum				2.00				2.00
Loans Payable [Member] | The TLB Facility [Member]
Long-term Debt, Current Maturities, Total				$ 5,000,000				$ 5,000,000
Long-term Debt, Percentage Bearing Fixed Interest, Amount														50,000,000	$ 150,000,000
Loans Payable [Member] | The TLB Facility [Member] | Forecast [Member]
Long-term Debt, Percentage Bearing Fixed Interest, Amount												$ 50,000,000
Loans Payable [Member] | The TLB Facility [Member] | Maximum [Member]
Debt Instrument, Repayment, Percent of Excess Cash Flow								75.00%
Loans Payable [Member] | The TLB Facility [Member] | Minimum [Member]
Debt Instrument, Repayment, Percent of Excess Cash Flow								0.00%
Loans Payable [Member] | Revolving Credit Facility [Member]
Finance Lease, Liability, Current				19,466,000				$ 19,466,000						20,115,000
Line of Credit Facility, Maximum Borrowing Capacity																	300,000,000
Debt Instrument, Basis Spread on Variable Rate		0.50%
Loans Payable [Member] | Revolving Credit Facility [Member] | Senior Secured Second Lien Notes due 2025 [Member]
Debt Instrument, Covenant, Maximum Additional Borrowings										$ 0
Loans Payable [Member] | The TLB Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity																	400,000,000
Line of Credit [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 400,000															$ 300,000,000
Letters of Credit Outstanding, Amount				146,934,000				146,934,000						125,938,000
Line of Credit Facility, Remaining Borrowing Capacity				$ 253,066,000				$ 253,066,000						$ 274,062,000
Line of Credit [Member] | Revolving Credit Facility and TLA Facility [Member]
Debt Instrument, Covenant, Net Leverage Ratio, Maximum				2.75	3.75			2.75				3.25
Debt Instrument, Covenant, Fixed Charge Coverage Ratio, Minimum				1.10				1.10
Debt Instrument, Maximum First Lien Gross Leverage Ratio				1.14				1.14
Debt Instrument, Maximum Net Leverage Ratio				1.70				1.70
Debt Instrument, Minimum Fixed Charge Coverage Ratio				1.89				1.89
Line of Credit [Member] | Revolving Credit Facility and TLA Facility [Member] | Forecast [Member]
Debt Instrument, Covenant, Net Leverage Ratio, Maximum											3.50
Debt Instrument, Covenant, Fixed Charge Coverage Ratio, Minimum												1.05	1.00
Line of Credit [Member] | Revolving Credit Facility and TLA Facility [Member] | Maximum [Member]
Debt Instrument, Covenant, First Lien Gross Leverage Ratio				1.75	2.50			1.75
Line of Credit [Member] | Revolving Credit Facility and TLA Facility [Member] | Maximum [Member] | Forecast [Member]
Debt Instrument, Covenant, First Lien Gross Leverage Ratio											2.25	2.00
Senior Notes [Member] | Senior Secured Second Lien Notes due 2025 [Member]
Debt Instrument, Interest Rate, Stated Percentage				11.00%		11.00%		11.00%	11.00%					11.00%		11.00%	11.00%
Repayments of Debt								$ 14,153,000	$ 25,480,000
Debt Instrument, Repurchased Face Amount				$ 15,190,000		$ 43,176,000		15,190,000	43,176,000
Repayments of Lines of Credit									$ 25,480,000
Senior Notes [Member] | The TLB Facility [Member]
Repayments of Lines of Credit								5,000,000
Secured Debt [Member] | Other Asset-backed Financing Maturing December 2020 [Member]
Debt Instrument, Collateral Amount				$ 2,451,000				$ 2,451,000
Debt, Weighted Average Interest Rate				3.61%				3.61%						3.61%

[1] Excludes current portion of Finance Lease Obligations of $21,261 and $18,219 at September 30, 2020 and December 31, 2019, respectively.