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Note 10 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Foreign Currency Translation Adjustments |  |  | Unrealized Gains (Losses) on Available-For-Sale Investments |  |  | Total |
Balance, December 31, 2021 |  | $ | (474 | ) |  | $ | (18 | ) |  | $ | (492 | )
Other comprehensive income (loss) |  |  | (514 | ) |  |  | 2 |  |  |  | (512 | )
Balance, December 31, 2022 |  | $ | (988 | ) |  | $ | (16 | ) |  | $ | (1,004 | )

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