Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017
Current assets:
Cash and cash equivalents	$ 115,136	$ 134,286	[1]
Short-term investments	24,594	21,329	[1]
Accounts receivable, net	85,176	71,125	[1]
Inventories	62,676	62,085	[1]
Other current assets	9,924	8,613	[1]
Total current assets	297,506	297,438	[1]
Property, plant and equipment, net	35,122	34,172	[1]
Goodwill	66,784	65,613	[1]
Intangible assets, net	16,131	16,748	[1]
Other assets	7,175	6,486	[1]
	422,718	420,457	[1]
Current liabilities:
Short-term borrowings	3,293	3,108	[1]
Current installments of long-term debt	1,291	1,280	[1]
Accounts payable	40,970	37,556	[1]
Accrued compensation and benefits	13,608	20,178	[1]
Accrued warranty	4,570	4,280	[1]
Deferred profit	2,914	6,608
Income taxes payable	1,546	2,159	[1]
Other accrued liabilities	9,959	10,098	[1]
Total current liabilities	78,151	85,267	[1]
Accrued retirement benefits	18,990	18,544	[1]
Noncurrent deferred gain on sale of facility	9,868	10,233	[1]
Deferred income taxes	3,812	2,921	[1]
Noncurrent income tax liabilities	6,435	6,270	[1]
Long-term debt	4,547	4,575	[1]
Other accrued liabilities	2,563	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, 28,796 shares issued and outstanding in 2018 and 28,489 shares in 2017	28,796	28,489	[1]
Paid-in capital	125,448	127,663	[1]
Retained earnings	158,124	150,726	[1]
Accumulated other comprehensive loss	(14,016)	(17,787)
Total stockholders' equity	298,352	289,091	[1]
	$ 422,718	$ 420,457	[1]

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