Note 4 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Note 4 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment, gross	$ 15,263	$ 14,230
Less accumulated depreciation and amortization	(13,231)	(12,453)
	2,032	1,777
Equipment [Member]
Note 4 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment, gross	8,419	8,366
Furniture and Fixtures [Member]
Note 4 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment, gross	603	570
Leasehold Improvements [Member]
Note 4 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment, gross	250	250
Software Development [Member]
Note 4 - Supplemental Balance Sheet Information (in thousands) (Details) - Property and Equipment [Line Items]
Property and equipment, gross	$ 5,991	$ 5,044