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Note 1 - Organization and Significant Accounting Policies - Revenues by Product Line (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | [2]
Total revenue | $ 48,087 | [1] | $ 27,371
Biopreservation Media [Member] |  |  |
Total revenue | 30,946 | [1] | 23,358
Automated Thawing Products [Member] |  |  |
Total revenue | 1,709 | [1] | 1,184
Product Revenue from Cold Chain Management [Member] |  |  |
Total revenue | 46 | [1] | 165
Freezers and Accessories [Member] |  |  |
Total revenue | 11,839 | [1] | 2,137
Product [Member] |  |  |
Total revenue | 44,540 |  | 26,844
Rental Revenue from Cold Chain Management [Member] |  |  |
Total revenue | 1,795 |  | 527
Rental Revenue [Member] |  |  |
Total revenue | 1,795 |  | 527
Biological and Pharmaceutical Storage [Member] |  |  |
Total revenue | 1,752 | [1] | 0
Service Revenue [Member] |  |  |
Total revenue | $ 1,752 |  | $ 0
[1] | 2020 revenue includes service revenue related to SciSafe from October 1, 2020 through December 31, 2020.
[2] | 2019 revenue includes automated thawing revenue related to Astero from April 1, 2019 through December 31, 2019; evo shipper rental revenue related to SAVSU from August 8, 2019 through December 31, 2019; and freezer and accessory revenue related to CBS from November 12, 2019 through December 31, 2019.

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