Note 1 - Basis of Presentation - Impact of Topic 606 (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017
Revenue
Total net revenue	$ 4,058				$ 1,699
Cost of revenue
Total cost of revenue	1,743				893
Net Income	893				(508)
Service [Member]
Revenue
Total net revenue	3,963				1,699
Cost of revenue
Total cost of revenue	1,607				893
Product [Member]
Revenue
Total net revenue	95
Cost of revenue
Total cost of revenue	$ 136
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenue
Total net revenue
Cost of revenue
Total cost of revenue
Net Income
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Service [Member]
Revenue
Total net revenue		166	162	159	149	636
Cost of revenue
Total cost of revenue		62	51	50	46	209
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Product [Member]
Revenue
Total net revenue		(166)	(162)	(159)	(149)	(636)
Cost of revenue
Total cost of revenue		$ (62)	$ (51)	$ (50)	$ (46)	$ (209)