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Note 3 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
Origin of income before taxes |  | 2022 |  |  | 2021 |
United States |  | $ | (1,262 | ) |  | $ | 798 |
Foreign |  |  | (126 | ) |  |  | (730 | )
Income (loss) before income taxes |  | $ | (1,388 | ) |  | $ | 68 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | 2022 |  |  | 2021 |
Current: |  |  |  |  |  |  |  |
Federal |  | $ | — |  |  | $ | — |
State |  |  | (6 | ) |  |  | (9 | )
Foreign |  |  | (10 | ) |  |  | — |
Total current |  |  | (16 | ) |  |  | (9 | )
Deferred: |  |  |  |  |  |  |  |
Federal |  |  | (19 | ) |  |  | — |
State |  |  | (19 | ) |  |  | (5 | )
Total deferred |  |  | (38 | ) |  |  | (5 | )
Income tax expense |  | $ | (54 | ) |  | $ | (14 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | 2022 |  |  | 2021 |
Provision at the U.S. federal statutory rate |  |  | 21.0 | % |  |  | 21.0 | %
State taxes, net of federal benefit |  |  | 3.1 | % |  |  | (15.5 | )%
Foreign tax rate differential |  |  | 0.4 | % |  |  | (30.2 | )%
Valuation allowance |  |  | (48.8 | )% |  |  | (1504.6 | )%
Chile outside basis differential |  |  | 0.4 | % |  |  | 34.4 | %
PPP Loan Forgiveness |  |  | — | % |  |  | (484.6 | )%
Accrual to return |  |  | 3.1 | % |  |  | (329.3 | )%
Research and development credit |  |  | 5.9 | % |  |  | (144.9 | )%
State rate change |  |  | 9.5 | % |  |  | (124.0 | )%
China deferred adjustment |  |  | — | % |  |  | 1006.0 | %
China enterprise tax |  |  | — | % |  |  | — | %
Share based compensation |  |  | 3.3 | % |  |  | 1590.3 | %
Other true up |  |  | — | % |  |  | — | %
Intangible assets impairment and other non-deductibles |  |  | — | % |  |  | — | %
Other |  |  | (1.8 | )% |  |  | 2.0 | %
Income tax (expense) benefit effective rate |  |  | (3.9 | )% |  |  | 20.6 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 2022 |  |  | 2021 |
Deferred tax assets: |  |  |  |  |  |  |  |
Stock compensation expense |  | $ | 272 |  |  | $ | 173 |
Goodwill |  |  | 182 |  |  |  | 591 |
Royalty accruals |  |  | 10 |  |  |  | 10 |
Bad debt allowance |  |  | 53 |  |  |  | 51 |
Net operating loss carryforwards |  |  | 12,158 |  |  |  | 11,950 |
Credit carry-forwards |  |  | 1,058 |  |  |  | 992 |
Inventory reserve |  |  | 233 |  |  |  | 217 |
Depreciation |  |  | 585 |  |  |  | 556 |
Research and Development Costs |  |  | 528 |  |  |  | — |
Other |  |  | 471 |  |  |  | 376 |
Total deferred tax assets |  |  | 15,550 |  |  |  | 14,916 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Intangible assets |  |  | (100 | ) |  |  | (105 | )
Total deferred tax liabilities |  |  | (100 | ) |  |  | (105 | )
Net deferred tax asset before valuation allowance |  |  | 15,450 |  |  |  | 14,811 |
Valuation allowances for deferred tax assets |  |  | (15,627 | ) |  |  | (14,950 | )
Net deferred tax liability |  | $ | (177 | ) |  | $ | (139 | )
Summary of Valuation Allowance [Table Text Block] |
Year |  | Balance at January 1 |  |  | Charged to costs and expenses |  |  | (Deductions)/Other |  |  | Balance at December 31 |
2021 |  | $ | 15,971 |  |  |  | (1,021 | ) |  |  | — |  |  | $ | 14,950 |
2022 |  | $ | 14,950 |  |  |  | 677 |  |  |  | — |  |  | $ | 15,627 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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