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Note 15 - Equity-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
(in thousands, except years and per share data) |  | Options |  |  | Weighted- Average Exercise Price |  |  | Weighted- Average Remaining Contractual Life (years) |  |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2021 |  |  | 127 |  |  | $ | 48.77 |  |  |  | 7.6 |  |  | $ | 460 |
Options granted |  |  | 19 |  |  | $ | 9.62 |  |  |  |  |  |  |  |  |
Restricted stock units granted |  |  | 5 |  |  | $ | — |  |  |  |  |  |  |  |  |
Restricted stock units vested |  |  | (3 | ) |  | $ | — |  |  |  |  |  |  |  |  |
Options forfeited/cancelled |  |  | (15 | ) |  | $ | 93.48 |  |  |  |  |  |  |  |  |
Restricted stock units cancelled |  |  | (1 | ) |  |  | — |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2022 |  |  | 132 |  |  | $ | 37.99 |  |  |  | 7.5 |  |  | $ | 69 |
Vested and expected to vest at December 31, 2022 |  |  | 97 |  |  | $ | 50.41 |  |  |  | 7.1 |  |  | $ | 10 |
Vested at December 31, 2022 |  |  | 63 |  |  | $ | 68.89 |  |  |  | 6.2 |  |  | $ | — |
Exercisable at December 31, 2022 |  |  | 63 |  |  | $ | 68.89 |  |  |  | 6.2 |  |  | $ | — |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | For the Years Ended December 31, |
|  | 2022 |  |  | 2021 |
Research and development |  | $ | 20 |  |  | $ | 10 |
Sales and marketing |  |  | 52 |  |  |  | 129 |
General and administrative |  |  | 148 |  |  |  | 794 |
Total stock-based compensation expense |  | $ | 220 |  |  | $ | 933 |
Employees and Directors [Member] |
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | For the Years Ended December 31, |
Assumptions |  | 2022 |  |  | 2021 |
Expected price volatility |  |  | 158 | % |  |  | 164 | %
Expected term (in years) |  |  | 6.45 |  |  |  | 6.19 |
Risk-free interest rate |  |  | 2.36 | % |  |  | 1.05 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Weighted-average fair value of options granted during the period |  | $ | 9.22 |  |  | $ | 22.37 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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