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Note 5 - Lease Obligations and Other Contingencies (Details Textual) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Operating Lease, Weighted Average Remaining Lease Term (Year) 11 years 4 months 24 days    
Operating Lease, Weighted Average Discount Rate, Percent 12.50%    
Operating Lease, Expense $ 1,306 $ 1,321  
Operating Lease, Payments 1,125 $ 1,235  
Operating Lease, Liability, Current 1,452    
Operating Lease, Liability, Noncurrent 5,035    
Operating Lease, Right-of-Use Asset 5,191    
Operating Lease, Right-of-Use Asset, Accumulated Amortization $ 2,328   $ 2,641
Accrued Liabilities, Current [Member]      
Operating Lease, Liability, Current     1,179
Other Noncurrent Liabilities [Member]      
Operating Lease, Liability, Noncurrent     3,871
Other Noncurrent Assets [Member]      
Operating Lease, Right-of-Use Asset     $ 3,802
Minimum [Member]      
Lessee, Operating Lease, Term of Contract (Year) 1 year    
Maximum [Member]      
Lessee, Operating Lease, Term of Contract (Year) 5 years