Note 7 - Goodwill and Other Intangible Assets (Detail) - Other Intangible Assets (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Intangible Assets, Gross	$ 3,100	$ 3,100
Intangible Assets, Impairment Charge	(148)	(148)
Intangible Assets, Accumulated Amortization	(1,392)	(1,249)
Intangible Assets, Net	1,560	1,703
Patents [Member]
Intangible Assets Estimated Useful Life (in months)	57 months	57 months
Intangible Assets, Gross	2,700	2,700
Intangible Assets, Accumulated Amortization	(1,140)	(997)
Intangible Assets, Net	1,560	1,703
Customer Relationships [Member]
Intangible Assets Estimated Useful Life (in months)	33 months	33 months
Intangible Assets, Gross	400	400
Intangible Assets, Impairment Charge	(148)	(148)
Intangible Assets, Accumulated Amortization	$ (252)	$ (252)