Note 7 - Restructuring Charge (Detail) - Timing of Payments Under the Restructuring Plan (USD $)	3 Months Ended			12 Months Ended
	Dec. 31, 2012	Sep. 30, 2010	Dec. 31, 2009	Dec. 31, 2012	Dec. 31, 2010
Restructuring charge	$ 253,000	$ 3,300,000	$ 1,200,000	$ 253,000	$ 3,339,000
Employee Severance [Member]
Restructuring charge	253,000
Cash payments during quarter ended December 31, 2012	(91,000)		1,100,000
Remaining liability as of December 31, 2012	$ 162,000			$ 162,000