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Note 3 - Fair Value Measurement (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 01, 2020 USD ($) | Jun. 30, 2020 USD ($)
Business Combination, Contingent Consideration, Liability, Total |  |  | $ 221,000 |  | $ 388,000
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ (4,754,000) | $ 2,875,000 | $ 1,575,000 |  |
SciSafe Holdings, Inc [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | 4,300,000 | 9,900,000 |  | $ 3,700,000 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ 5,600,000 | $ 3,000,000.0 |  |  |
Measurement Input, Discount Rate [Member] | SciSafe Holdings, Inc [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.128 |  |  | 0.045 |
Measurement Input, Risk Free Interest Rate [Member] | SciSafe Holdings, Inc [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.041 |  |  | 0.0020 |
Measurement Input, Asset Price Volatility [Member] | SciSafe Holdings, Inc [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  | 0.60 |
Measurement Input, Revenue Volatility [Member] | SciSafe Holdings, Inc [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.30 |  |  | 0.15 |
Measurement Input Asset Volatility [Member] | SciSafe Holdings, Inc [Member] |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.68 |  |  |  |
Measurement Input, Price Volatility [Member] | Minimum [Member] |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  | 0.568 |  |
Measurement Input, Price Volatility [Member] | Maximum [Member] |  |  |  |  |
Warrants and Rights Outstanding, Measurement Input |  |  | 0.846 |  |
Convertible Debt Securities [Member] | Minimum [Member] |  |  |  |  |
Debt Securities, Term (Year) | 1 year |  |  |  |
Convertible Debt Securities [Member] | Maximum [Member] |  |  |  |  |
Debt Securities, Term (Year) | 2 years |  |  |  |
Convertible Debt Securities [Member] | Measurement Input, Prepayment Rate [Member] |  |  |  |  |
Debt Securities, Trading, Measurement Input | 0.080 |  |  |  |
Convertible Debt Securities [Member] | Measurement Input, Prepayment Rate [Member] | Minimum [Member] |  |  |  |  |
Debt Securities, Trading, Measurement Input | 0.05 |  |  |  |
Convertible Debt Securities [Member] | Measurement Input, Prepayment Rate [Member] | Maximum [Member] |  |  |  |  |
Debt Securities, Trading, Measurement Input |  | 0.50 |  |  |

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