Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 64,816	$ 53,911
Accounts receivable, net of allowance for doubtful accounts of $1,975 and $1,638, respectively	79,110	91,939
Inventories	110,209	120,068
Unbilled receivables	14,868	15,799
Other current assets	9,058	8,792
Total current assets	278,061	290,509
Property, plant and equipment, net	42,470	43,932
Right-of-use assets	16,296
Intangible assets, net	57,509	62,689
Goodwill	10,778	19,817
Deferred income taxes	2,283	496
Other assets	26,948	26,081
Total assets	434,345	443,524
Current Liabilities:
Accounts payable	38,890	56,171
Accrued expenses	31,069	32,290
Current portion of long-term debt	4,743	2,508
Operating lease liability, current	6,039
Other current liabilities	5,785	15,061
Total current liabilities	86,526	106,030
Long-term Liabilities:
Long-term debt	107,588	111,705
Operating lease liability, long-term	10,713
Liability for uncertain tax positions	26,464	27,553
Minimum pension obligation and unfunded pension liability	19,346	18,683
Deferred income taxes	1,319	1,161
Other liabilities	11,749	1,922
Total liabilities	263,705	267,054
Commitments and contingencies
Stockholders' Equity:
Preferred stock, no par value, 1,000,000 shares authorized; none issued
Additional paid-in capital	33,206	31,387
Retained earnings	164,252	168,695
Accumulated other comprehensive loss	(28,045)	(24,838)
Total stockholders' equity	170,640	176,470
Total liabilities and stockholders' equity	434,345	443,524
Common Class A [Member]
Stockholders' Equity:
Common stock	214	217
Common Class B [Member]
Stockholders' Equity:
Common stock	$ 1,013	$ 1,009