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Note 8 - Lease Obligations - Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Amortization of right-of-use assets	$ 1,007	$ 1,037
Interest on lease liabilities	174	247
Operating lease cost	5,911	6,602
Variable lease cost	63	158
Total lease cost	7,155	8,044
Operating cash flows from finance leases	1,007	1,037
Operating cash flows from operating leases	5,974	6,760
Financing cash flows from finance leases	633	1,305
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 224	$ 461
Weighted-average remaining lease term—finance leases (Year)	1 year 9 months 18 days
Weighted-average remaining lease term—operating leases (Year)	2 years 1 month 6 days
Weighted-average discount rate—finance leases	4.30%
Weighted-average discount rate—operating leases	5.30%

X

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Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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