Note 9 - Segment Information (Details) - Net Revenue from Unaffiliated Customers (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net revenues from unaffiliated customers:
Revenues	$ 10,188	$ 8,797
UNITED STATES
Net revenues from unaffiliated customers:
Revenues	3,489	3,149
Foreign [Member]
Net revenues from unaffiliated customers:
Revenues	$ 6,699	$ 5,648