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Note 2 - Summary of Significant Accounting Policies (Detail) - Summary of Stock-based Compensation (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allocated Share-based Compensation Expense	$ 45	$ 58
Research and Development Expense [Member]
Allocated Share-based Compensation Expense	7	6
Selling and Marketing Expense [Member]
Allocated Share-based Compensation Expense	8	8
General and Administrative Expense [Member]
Allocated Share-based Compensation Expense	$ 30	$ 44

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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