Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 25, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 83,836	$ 96,045	[1]
Short-term investments	22,369	31,990	[1]
Accounts receivable, net	82,140	63,019	[1]
Inventories:
Raw materials and purchased parts	27,056	23,037	[1]
Work in process	21,741	17,599	[1]
Finished goods	5,726	4,866	[1]
	54,523	45,502	[1]
Other current assets	10,917	8,593	[1]
Total current assets	253,785	245,149	[1]
Property, plant and equipment, at cost:
Land and land improvements	7,656	4,079	[1]
Buildings and building improvements	13,687	7,967	[1]
Machinery and equipment	41,269	35,157	[1]
	62,612	47,203	[1]
Less accumulated depreciation and amortization	(30,245)	(28,969)	[1]
Net property, plant and equipment	32,367	18,234	[1]
Goodwill	63,048	58,849	[1]
Intangible assets, net	22,097	17,835	[1]
Other assets	7,470	5,445	[1]
	378,767	345,512	[1]
Current liabilities:
Short-term borrowings	3,178		[1]
Current installments of long-term debt	1,190		[1]
Accounts payable	37,727	31,444	[1]
Accrued compensation and benefits	15,770	14,770	[1]
Accrued warranty	4,263	3,737	[1]
Deferred profit	4,795	6,886	[1]
Income taxes payable	2,089	1,920	[1]
Other accrued liabilities	12,490	9,932	[1]
Total current liabilities	81,502	68,689	[1]
Accrued retirement benefits	16,567	15,673	[1]
Noncurrent deferred gain on sale of facility	11,325	11,689	[1]
Deferred income taxes	7,639	5,852	[1]
Noncurrent income tax liabilities	7,149	6,375	[1]
Long-term debt, excluding current installments	5,894		[1]
Other accrued liabilities	3,335	1,765	[1]
Stockholders' equity:
Preferred stock, $1 par value; 1,000 shares authorized, none issued			[1]
Common stock, $1 par value; 60,000 shares authorized, 27,278 shares issued and outstanding in 2017 and 26,842 shares in 2016	27,278	26,842	[1]
Paid-in capital	112,274	111,950	[1]
Retained earnings	129,708	124,559	[1]
Accumulated other comprehensive loss	(23,904)	(27,882)
Total stockholders' equity	245,356	235,469	[1]
	$ 378,767	$ 345,512	[1]

[1] Derived from December 31, 2016 audited financial statements