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Note 6 - Lease Obligations and Other Contingencies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019
Retained Earnings (Accumulated Deficit), Ending Balance | $ (1,023,442) | $ (840,628) |
Operating Lease, Weighted Average Remaining Lease Term (Year) | 13 years 1 month 6 days |  |
Operating Lease, Weighted Average Discount Rate, Percent | 12.70% |  |
Operating Lease, Expense | $ 1,754 | 1,464 |
Operating Lease, Payments | 1,696 | 1,457 |
Operating Lease, Right-of-Use Asset, Accumulated Amortization | 2,641 | 1,386 |
Accrued Liabilities, Current [Member] |  |  |
Operating Lease, Liability, Current | 1,179 | 1,377 |
Other Noncurrent Liabilities [Member] |  |  |
Operating Lease, Liability, Noncurrent | 3,871 | 3,406 |
Other Noncurrent Assets [Member] |  |  |
Operating Lease, Right-of-Use Asset | $ 3,802 | $ 3,590 |
Minimum [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  | 1 year |
Maximum [Member] |  |  |
Lessee, Operating Lease, Term of Contract (Year) |  | 5 years |
Accounting Standards Update 2016-02 [Member] |  |  |
Operating Lease, Right-of-Use Asset |  |  | $ 3,621
Operating Lease, Liability, Total |  |  | 4,822
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  | $ 238

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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