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Note 8 - Share-based Compensation - Share-based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Total share-based compensation expense	$ 1,145	$ 1,170	$ 3,577	$ 4,848
Share-based compensation capitalized in intangible assets	23	34	94	120
Total share-based compensation	1,168	1,204	3,671	4,968
Selling and Marketing Expense [Member]
Total share-based compensation expense	188	172	560	659
Research and Development Expense [Member]
Total share-based compensation expense	167	291	668	814
General and Administrative Expense [Member]
Total share-based compensation expense	$ 790	$ 707	$ 2,349	$ 3,375

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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