Note 5 - Lease Obligations and Other Contingencies (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating Lease, Weighted Average Remaining Lease Term (Year)	13 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	12.80%
Operating Lease, Expense	$ 913	$ 935
Operating Lease, Payments	819	$ 841
Operating Lease, Right-of-Use Asset, Accumulated Amortization	2,111		$ 2,641
Accrued Liabilities, Current [Member]
Operating Lease, Liability, Current	981		1,179
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	4,100		3,871
Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset	$ 3,813		$ 3,802
Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	1 year
Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years