Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 121,984	$ 96,045	[1]
Short-term investments	16,340	31,990	[1]
Accounts receivable, net	76,548	63,019	[1]
Inventories:
Raw materials and purchased parts	26,470	23,037	[1]
Work in process	22,711	17,599	[1]
Finished goods	7,230	4,866	[1]
	56,411	45,502	[1]
Other current assets	8,288	8,593	[1]
Total current assets	279,571	245,149	[1]
Property, plant and equipment, at cost:
Land and land improvements	7,917	4,079	[1]
Buildings and building improvements	13,612	7,967	[1]
Machinery and equipment	45,292	35,157	[1]
	66,821	47,203	[1]
Less accumulated depreciation and amortization	(32,558)	(28,969)	[1]
Net property, plant and equipment	34,263	18,234	[1]
Goodwill	65,483	58,849	[1]
Intangible assets, net	17,766	17,835	[1]
Other assets	7,381	5,445	[1]
	404,464	345,512	[1]
Current liabilities:
Short-term borrowings	3,130		[1]
Current installments of long-term debt	1,300		[1]
Accounts payable	29,907	31,444	[1]
Accrued compensation and benefits	18,509	14,770	[1]
Accrued warranty	4,344	3,737	[1]
Deferred profit	6,721	6,886	[1]
Income taxes payable	2,725	1,920	[1]
Other accrued liabilities	10,526	9,932	[1]
Total current liabilities	77,162	68,689	[1]
Accrued retirement benefits	17,033	15,673	[1]
Noncurrent deferred gain on sale of facility	10,597	11,689	[1]
Deferred income taxes	7,132	5,852	[1]
Noncurrent income tax liabilities	6,600	6,375	[1]
Long-term debt, excluding current installments	4,853		[1]
Other accrued liabilities	2,290	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, 28,213 shares issued and outstanding in 2017 and 26,842 shares in 2016	28,213	26,842	[1]
Paid-in capital	123,064	111,950	[1]
Retained earnings	145,536	124,559	[1]
Accumulated other comprehensive loss	(18,016)	(27,882)
Total stockholders' equity	278,797	235,469	[1]
	$ 404,464	$ 345,512	[1]

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