Note 3 - Significant Customers, Concentration of Credit Risk, and Geographic Information - Geographic Activity, Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net revenues	$ 2,439	$ 2,150
Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Percentage of total revenues	100.00%	100.00%
North America [Member]
Net revenues	$ 1,544	$ 1,251
North America [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Percentage of total revenues	63.30%	58.20%
Europe [Member]
Net revenues	$ 470	$ 488
Europe [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Percentage of total revenues	19.30%	22.70%
Asia Pacific [Member]
Net revenues	$ 403	$ 402
Asia Pacific [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Percentage of total revenues	16.50%	18.70%
Other Geographic Areas [Member]
Net revenues	$ 22	$ 9
Other Geographic Areas [Member] | Geographic Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Percentage of total revenues	0.90%	0.40%