Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current Assets:
Cash and cash equivalents	$ 51,235	$ 61,756
Accounts receivable, net of allowance for doubtful accounts of $1,347 and $1,536, respectively	93,683	87,135
Inventories	155,341	139,383
Unbilled receivables	20,556	28,275
Assets held for sale	1,626	1,626
Other current assets	11,649	10,841
Total current assets	334,090	329,016
Property, plant and equipment, net	37,569	38,210
Right-of-use assets	25,126	21,252
Intangible assets, net	58,878	60,995
Goodwill	26,272	26,651
Deferred income taxes	5,294	4,461
Other assets	33,052	31,261
Total assets	520,281	511,846
Current Liabilities:
Accounts payable	64,615	65,960
Accrued expenses	30,116	34,453
Operating lease liabilities, current	7,063	6,880
Other current liabilities	7,646	4,719
Total current liabilities	109,440	112,012
Long-term Liabilities:
Long-term debt	112,500	112,500
Operating lease liabilities, long-term	18,290	14,668
Liability for uncertain tax positions	28,740	28,434
Minimum pension obligation and unfunded pension liability	24,051	23,909
Deferred income taxes	1,583	1,487
Other liabilities	10,321	10,093
Total liabilities	304,925	303,103
Commitments and contingencies (see Note 14)
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued	0	0
Additional paid-in capital	38,996	38,419
Retained earnings	192,143	187,935
Accumulated other comprehensive loss	(17,034)	(18,863)
Total stockholders' equity	215,356	208,743
Total liabilities and stockholders' equity	520,281	511,846
Common Class A [Member]
Stockholders' Equity:
Common stock	214	214
Common Class B [Member]
Stockholders' Equity:
Common stock	$ 1,037	$ 1,038