Note 12 - Segment Information - Segment Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue	$ 2,267	$ 2,370	$ 4,706	$ 4,520
Power Supplies [Member]
Revenue	1,422	1,255	3,113	2,604
Data Storage [Member]
Revenue	845	1,115	1,593	1,916
Data Storage [Member] | Product [Member]
Revenue	446	653	867	981
Data Storage [Member] | Service [Member]
Revenue	$ 399	$ 462	$ 726	$ 935