Note 13 - Segment Data (Details) - Geographic Revenue Related to North America and Foreign Regions (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	Dec. 31, 2012
Note 13 - Segment Data (Details) - Geographic Revenue Related to North America and Foreign Regions [Line Items]
Revenues	$ 2,870	$ 4,212	$ 3,262	$ 3,433	$ 4,322	$ 4,168	$ 3,818	$ 3,280	$ 13,777	$ 15,588	$ 13,855
North America [Member]
Note 13 - Segment Data (Details) - Geographic Revenue Related to North America and Foreign Regions [Line Items]
Revenues									7,700	8,317	7,947
Pacific Rim [Member]
Note 13 - Segment Data (Details) - Geographic Revenue Related to North America and Foreign Regions [Line Items]
Revenues									4,962	4,861	3,340
Europe [Member]
Note 13 - Segment Data (Details) - Geographic Revenue Related to North America and Foreign Regions [Line Items]
Revenues									$ 1,115	$ 2,410	$ 2,568