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Note 2 - Fair Value Measurement (Details Textual) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Oct. 01, 2020 USD ($) | Nov. 10, 2019 | Apr. 01, 2019
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ (140,000) | $ (2,000) | $ 1,086,000 | $ (1,528,000) |  |  |  |
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 |  |  |
Astero [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | 0 |  | (81,000) |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  |  |  | $ 81,000 |  |  |
Astero [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  |  | 0.175
Astero [Member] | Measurement Input, Risk Free Interest Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  |  | 0.0229
Astero [Member] | Measurement Input, Risk Free Interest Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  |  | 0.0241
Astero [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input |  |  |  |  |  |  |  | 0.56
CBS Acquisition [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | $ 140,000 |  | $ 140,000 |  | 140,000 |  |  |
CBS Acquisition [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.210 |  | 0.210 |  |  |  | 0.260 |
CBS Acquisition [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.0023 |  | 0.0023 |  |  |  | 0.0174 |
CBS Acquisition [Member] | Measurement Input, Price Volatility [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.63 |  | 0.63 |  |  |  | 0.70 |
SciSafe Holdings, Inc [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ (141,000) |  | $ 1,200,000 |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total | $ 8,100,000 |  | $ 8,100,000 |  | $ 6,900,000 | $ 3,700,000 |  |
SciSafe Holdings, Inc [Member] | Measurement Input, Discount Rate [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.068 |  | 0.068 |  |  | 0.045 |  |
SciSafe Holdings, Inc [Member] | Measurement Input, Risk Free Interest Rate [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.0047 |  | 0.0047 |  |  | 0.0020 |  |
SciSafe Holdings, Inc [Member] | Measurement Input, Asset Price Volatility [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.61 |  | 0.61 |  |  | 0.60 |  |
SciSafe Holdings, Inc [Member] | Measurement Input, Revenue Volatility [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.22 |  | 0.22 |  |  | 0.15 |  |

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