Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 24, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 92,472	$ 96,045	[1]
Short-term investments	21,810	31,990	[1]
Accounts receivable, net	90,478	63,019	[1]
Inventories:
Raw materials and purchased parts	28,120	23,037	[1]
Work in process	25,641	17,599	[1]
Finished goods	6,586	4,866	[1]
	60,347	45,502	[1]
Other current assets	11,344	8,593	[1]
Total current assets	276,451	245,149	[1]
Property, plant and equipment, at cost:
Land and land improvements	7,779	4,079	[1]
Buildings and building improvements	13,381	7,967	[1]
Machinery and equipment	42,996	35,157	[1]
	64,156	47,203	[1]
Less accumulated depreciation and amortization	(31,313)	(28,969)	[1]
Net property, plant and equipment	32,843	18,234	[1]
Goodwill	66,038	58,849	[1]
Intangible assets, net	18,742	17,835	[1]
Other assets	7,270	5,445	[1]
	401,344	345,512	[1]
Current liabilities:
Short-term borrowings	3,172		[1]
Current installments of long-term debt	1,409		[1]
Accounts payable	40,507	31,444	[1]
Accrued compensation and benefits	16,251	14,770	[1]
Accrued warranty	4,393	3,737	[1]
Deferred profit	6,347	6,886	[1]
Income taxes payable	2,220	1,920	[1]
Other accrued liabilities	11,322	9,932	[1]
Total current liabilities	85,621	68,689	[1]
Accrued retirement benefits	16,986	15,673	[1]
Noncurrent deferred gain on sale of facility	10,961	11,689	[1]
Deferred income taxes	7,228	5,852	[1]
Noncurrent income tax liabilities	7,280	6,375	[1]
Long-term debt, excluding current installments	5,265		[1]
Other accrued liabilities	3,455	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, 27,889 shares issued and outstanding in 2017 and 26,842 shares in 2016	27,889	26,842	[1]
Paid-in capital	118,799	111,950	[1]
Retained earnings	138,464	124,559	[1]
Accumulated other comprehensive loss	(20,604)	(27,882)
Total stockholders' equity	264,548	235,469	[1]
	$ 401,344	$ 345,512	[1]

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