Note 3 - Supplemental Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2014

Note 3 - Supplemental Balance Sheet Information

Inventory

	December 31,
	2014		2013
Raw materials	$	15,100	$	16,239
Work in process		1,489		1,674
Finished products		9,497		8,140
Total	$	26,086	$	26,053

Major classes of property, plant and equipment

	December 31,
	2014			2013
Land	$	123		$	123
Buildings and leasehold improvements		7,437			7,412
Machinery and equipment		48,054			47,405
Furniture and fixtures		1,811			1,866
Computer hardware and software		4,452			4,247
Construction in progress		1,351			1,073
		63,228			62,126
Less – Accumulated depreciation		(53,416	)		(51,924	)
Total	$	9,812		$	10,202

Goodwill activity by segment

	Battery & Energy Products			Communi- cations Systems		Total
Balance – January 1, 2013	$	4,851		$	11,493	$	16,344
Effect of foreign currency translation		75			—		75
Balance – December 31, 2013		4,926			11,493		16,419
Effect of foreign currency translation		(12	)		—		(12	)
Balance – December 31, 2014	$	4,914		$	11,493	$	16,407

Composition of intangible assets

	December 31, 2014
	Cost		Accumulated Amortization		Net
Trademarks	$	3,567	$	—	$	3,567
Patents and technology		4,509		4,114		395
Customer relationships		4,029		3,679		350
Distributor relationships		391		365		26
Total other intangible assets	$	12,496	$	8,158	$	4,338

	December 31, 2013
	Cost		Accumulated Amortization		Net
Trademarks	$	3,568	$	—	$	3,568
Patents and technology		4,511		3,941		570
Customer relationships		4,033		3,562		471
Distributor relationships		393		356		37
Total other intangible assets	$	12,505	$	7,859	$	4,646

Amortization of intangible assets

	Year ended December 31,
	2014		2013
Research and development expense	$	176	$	223
Selling, general and administrative expense		129		179
Total	$	305	$	402