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Note 10 - Stock-Based Compensation (Detail) - Allocation of Share-Based Compensation Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cost of Sales [Member]
Allocated Share-Based Compensation Expense	$ 1	$ 2
Selling Expense [Member]
Allocated Share-Based Compensation Expense	2	2
Engineering and Product Development Expense [Member]
Allocated Share-Based Compensation Expense	6	6
General and Administrative Expense [Member]
Allocated Share-Based Compensation Expense	18	17
Total [Member]
Allocated Share-Based Compensation Expense	$ 27	$ 27

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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