Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Gain (Loss), Foreign Currency Transaction, before Tax	$ (1,356)	$ 278
Intangible Assets, Percent of Total Assets	8.60%	9.70%
Excessive Dividend Rate of Class B Over Class A	5.00%
Excessive Undistributed Earnings Allocation Rate of Class B Over Class A	5.00%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	0	0
Research and Development Expense	$ 22,487	$ 20,238
Common Class B [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.1	$ 0.1
Common Class A [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.1	$ 0.1
Other Current Assets [Member]
Asset, Held-for-Sale, Not Part of Disposal Group, Current	$ 1,300
Minimum [Member]
Standard Product Warranty, Period (Year)	1 year
Finite-Lived Intangible Asset, Useful Life (Year)	1 year
Minimum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	1 year
Minimum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years
Maximum [Member]
Standard Product Warranty, Period (Year)	3 years
Finite-Lived Intangible Asset, Useful Life (Year)	16 years
Maximum [Member] | Building and Building Improvements [Member]
Property, Plant and Equipment, Useful Life (Year)	33 years
Maximum [Member] | Machinery and Equipment [Member]
Property, Plant and Equipment, Useful Life (Year)	14 years