Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 71,320	$ 89,371
Held to maturity U.S. Treasury securities	49,900	37,548
Accounts receivable, net of allowance of $1,508 and $1,388, respectively	83,458	84,129
Inventories	130,459	136,540
Unbilled receivables	9,150	12,793
Other current assets	20,052	21,097
Total current assets	364,339	381,478
Property, plant and equipment, net	36,036	36,533
Right-of-use assets	21,328	20,481
Equity method investment	10,324	10,282
Intangible assets, net	47,868	49,391
Goodwill, net	25,347	26,642
Deferred income taxes	13,052	11,553
Other assets	34,399	33,119
Total assets	555,337	571,631
Current Liabilities:
Accounts payable	32,818	40,441
Accrued expenses	36,772	54,657
Operating lease liabilities, current	5,730	6,350
Other current liabilities	11,181	9,161
Total current liabilities	86,501	110,609
Long-term Liabilities:
Long-term debt	60,000	60,000
Operating lease liabilities, long-term	15,727	14,212
Liability for uncertain tax positions	19,951	19,823
Minimum pension obligation and unfunded pension liability	20,174	19,876
Deferred income taxes	1,307	1,456
Other long-term liabilities	5,020	5,097
Total liabilities	208,680	231,073
Commitments and contingencies (see Note 15)
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Treasury stock (unrestricted, consisting of 14,132 Class A shares and 115,481 Class B shares)	(6,737)	(454)
Additional paid-in capital	45,069	44,260
Retained earnings	322,508	307,510
Accumulated other comprehensive loss	(15,457)	(12,037)
Total stockholders' equity	346,657	340,558
Total liabilities and stockholders' equity	555,337	571,631
Common Class A [Member]
Stockholders' Equity:
Common stock	213	214
Common Class B [Member]
Stockholders' Equity:
Common stock	1,061	1,065
Related Party [Member]
Current Assets:
Related party note receivable	$ 2,644	$ 2,152