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Note 8 - Stock-based Compensation Expense (Detail) (Selling, General and Administrative Expenses [Member], USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense	$ 58,000	$ 76,000

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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