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Note 9 - Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Foreign Currency Translation Adjustments |  |  | Unrealized Losses on Available-For-Sale Investments |  |  | Total |
Balance, December 31, 2021 |  | $ | (474 | ) |  | $ | (18 | ) |  | $ | (492 | )
Other comprehensive loss |  |  | (828 | ) |  |  | (21 | ) |  |  | (849 | )
Balance, September 30, 2022 |  | $ | (1,302 | ) |  | $ | (39 | ) |  | $ | (1,341 | )

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