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Note 5 - Lease Obligations and Other Contingencies (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Operating Lease, Weighted Average Remaining Lease Term (Year) 13 years 4 months 24 days    
Operating Lease, Weighted Average Discount Rate, Percent 12.80%    
Operating Lease, Expense $ 452 $ 448  
Operating Lease, Payments 440 $ 408  
Operating Lease, Right-of-Use Asset, Accumulated Amortization 2,940   $ 2,641
Accrued Liabilities, Current [Member]      
Operating Lease, Liability, Current 1,001   1,179
Other Noncurrent Liabilities [Member]      
Operating Lease, Liability, Noncurrent 3,883   3,871
Other Noncurrent Assets [Member]      
Operating Lease, Right-of-Use Asset $ 3,625   $ 3,802
Minimum [Member]      
Lessee, Operating Lease, Term of Contract (Year) 1 year    
Maximum [Member]      
Lessee, Operating Lease, Term of Contract (Year) 5 years