Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Equivalents, at Carrying Value		$ 0	$ 0
Cash and Cash Equivalents, Held in Foreign Currency	$ 3,700	$ 3,200
Treasury Stock, Shares, Acquired (in shares)	0	0	0
Research and Development Expense	$ 7,200	$ 9,300	$ 8,500
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years