Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 24, 2016	Dec. 26, 2015
Current assets:
Cash and cash equivalents	$ 109,217	$ 115,370	[1]
Short-term investments	19,451	1,652	[1]
Accounts receivable, net	56,826	59,832	[1]
Inventories:
Raw materials and purchased parts	24,906	24,423	[1]
Work in process	18,005	20,124	[1]
Finished goods	5,256	6,801	[1]
	48,167	51,348	[1]
Other current assets	7,172	6,261	[1]
Total current assets	240,833	234,463	[1]
Property, plant and equipment, at cost:
Land and land improvements	4,316	4,607	[1]
Buildings and building improvements	8,016	8,971	[1]
Machinery and equipment	34,887	31,888	[1]
	47,219	45,466	[1]
Less accumulated depreciation and amortization	(28,407)	(26,466)	[1]
Net property, plant and equipment	18,812	19,000	[1]
Goodwill	61,028	60,264	[1]
Intangible assets, net	20,338	25,297	[1]
Other assets	6,477	6,322	[1]
	347,488	345,346	[1]
Current liabilities:
Accounts payable	25,699	27,290	[1]
Accrued compensation and benefits	17,394	15,628	[1]
Accrued warranty	3,787	3,785	[1]
Deferred profit	5,726	3,730
Income taxes payable	1,787	4,195	[1]
Other accrued liabilities	9,137	8,563	[1]
Total current liabilities	63,530	63,191	[1]
Accrued retirement benefits	16,040	15,397	[1]
Noncurrent deferred gain on sale of facility	12,053	13,142	[1]
Deferred income taxes	6,006	6,954	[1]
Noncurrent income tax liabilities	6,807	6,761	[1]
Other accrued liabilities	2,089	1,764	[1]
Commitments and contingencies			[1]
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued			[1]
Common stock, $1 par value; 60,000 shares authorized, 26,712 shares issued and outstanding in 2016 and 26,240 shares in 2015	26,712	26,240	[1]
Paid-in capital	108,995	105,516	[1]
Retained earnings	124,340	128,153	[1]
Accumulated other comprehensive loss	(19,084)	(21,772)
Total stockholders' equity	240,963	238,137	[1]
	$ 347,488	$ 345,346	[1]

[1] Derived from December 26, 2015 audited financial statements