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Note 2 - Significant Accounting Policies (Details Textual) $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares
Impairment of Long-Lived Assets Held-for-use | $ 0 |
Number of Operating Segments | 1 |
Furniture and Fixtures [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |
Office Equipment [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |
Equipment [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |
Vehicles [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |
Mobile Facility [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 27 years 6 months |
Building [Member] |  |
Property, Plant and Equipment, Useful Life (Year) | 39 years |
Fair Value, Recurring [Member] |  |
Assets, Fair Value Disclosure | $ 0 | $ 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 | $ 0
Janssen [Member] | Manufacturing Revenue [Member] |  |
Treasury Stock, Shares, Acquired (in shares) | shares | 4.5 | 4.5

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