Note 3 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Note 3 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment	$ 16,512	$ 15,263
Less accumulated depreciation and amortization	(14,337)	(13,231)
	2,175	2,032
Equipment [Member]
Note 3 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment	8,562	8,419
Furniture and Fixtures [Member]
Note 3 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment	650	603
Leaseholds and Leasehold Improvements [Member]
Note 3 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment	263	250
Software Development [Member]
Note 3 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment	$ 7,037	$ 5,991