Note 14 - Segment Information (Details) - Net Revenue from Unaffiliated Customers (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Note 14 - Segment Information (Details) - Net Revenue from Unaffiliated Customers [Line Items]
Revenues	$ 9,862	$ 10,794	$ 12,343	$ 8,797	$ 9,335	$ 9,900	$ 11,218	$ 8,973	$ 41,796	$ 39,426
UNITED STATES
Note 14 - Segment Information (Details) - Net Revenue from Unaffiliated Customers [Line Items]
Revenues									14,363	13,337
Foreign [Member]
Note 14 - Segment Information (Details) - Net Revenue from Unaffiliated Customers [Line Items]
Revenues									$ 27,433	$ 26,089