Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 29, 2018		Dec. 30, 2017
Current assets:
Cash and cash equivalents	$ 170,695		$ 134,286	[1]
Short-term investments	549		21,329	[1]
Accounts receivable, net	78,575		71,125	[1]
Inventories	63,824		62,085	[1]
Other current assets	8,643		8,613	[1]
Total current assets	322,286		297,438	[1]
Property, plant and equipment, net	32,922		34,172	[1]
Goodwill	64,579		65,613	[1]
Intangible assets, net	13,512		16,748	[1]
Other assets	9,707		6,486	[1]
	443,006		420,457	[1]
Current liabilities:
Short-term borrowings	3,080		3,108	[1]
Current installments of long-term debt	1,021		1,280	[1]
Accounts payable	39,770		37,556	[1]
Accrued compensation and benefits	17,746		20,178	[1]
Accrued warranty	4,357		4,280	[1]
Deferred profit	1,894	[2]	6,608
Income taxes payable	6,072		2,159	[1]
Other accrued liabilities	15,985		10,098	[1]
Total current liabilities	89,925		85,267	[1]
Accrued retirement benefits	18,783		18,544	[1]
Noncurrent deferred gain on sale of facility	9,140		10,233	[1]
Deferred income taxes	3,166		2,921	[1]
Noncurrent income tax liabilities	6,293		6,270	[1]
Long-term debt	3,840		4,575	[1]
Other accrued liabilities	2,852		3,556	[1]
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued				[1]
Common stock, $1 par value; 60,000 shares authorized, 28,901 shares issued and outstanding in 2018 and 28,489 shares in 2017	28,901		28,489	[1]
Paid-in capital	130,194		127,663	[1]
Retained earnings	171,110	[2]	150,726	[1]
Accumulated other comprehensive loss	(21,198)		(17,787)
Total stockholders' equity	309,007		289,091	[1]
	$ 443,006		$ 420,457	[1]

[1] Derived from December 30, 2017 audited financial statements

[2] Balance sheet line items include the cumulative-effect adjustment recorded on December 31, 2017.