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Note 1 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands |  | 1 Months Ended | 12 Months Ended | 139 Months Ended | 211 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 03, 2009 | Jun. 30, 2003 | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2020 USD ($) shares
Number of Operating Segments |  |  | 1 |  |  |  |
Number of Reportable Segments |  |  | 1 |  |  |  |
Cash Equivalents, at Carrying Value, Total | $ |  |  | $ 0 | $ 0 |  | $ 0 | $ 0
Cash, Uninsured Amount | $ |  |  | 26,100 |  |  | 26,100 | 26,100
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ |  |  | $ 48,300 |  |  | 48,300 | 48,300
Treasury Stock, Shares, Acquired (in shares) |  |  | 0 | 0 | 0 |  |
Research and Development Expense, Total | $ |  |  | $ 8,200 | $ 8,800 | $ 10,500 |  |
Operating Lease, Liability, Current | $ |  |  | 1,154 | 1,150 |  | 1,154 | 1,154
Operating Lease, Liability, Noncurrent | $ |  |  | $ 950 | 1,940 |  | $ 950 | $ 950
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |
Operating Lease, Liability, Current | $ |  |  |  | 476 |  |  |
Operating Lease, Liability, Noncurrent | $ |  |  |  | $ (476) |  |  |
The 2003 Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  |  |  |  |  |  | 1,275,035
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  | 185,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  | 10,000 |  |  | 10,000 | 10,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 800,834 |  |  | 800,834 | 800,834
The 2003 Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 5 years |  |  |  |  |
The 2003 Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  |  |  |  |  |  | 0
The 2003 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 88,412 |  |  | 88,412 | 88,412
Nonemployee Director Stock Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  | 379,918 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  | 84,513 |  |  | 84,513 | 84,513
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 59,980 |  |  | 59,980 | 59,980
Nonemployee Director Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |
Nonemployee Director Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 4,776 |  |  | 4,776 | 4,776
Minimum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  | 5 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life (Year) |  |  | 20 years |  |  |  |

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