Note 11 - Segment Information - Segment Revenue (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Revenue
Power Supplies	$ 4,924	$ 9,417	$ 10,978	$ 12,902
Data Storage:
Power Supplies	4,924	9,417	10,978	12,902
Power Supplies [Member]
Revenue
Power Supplies	2,463	5,601	5,842	6,330
Data Storage:
Power Supplies	2,463	5,601	5,842	6,330
Data Storage [Member]
Revenue
Power Supplies	2,461	3,816	5,136	6,572
Data Storage:
Power Supplies	2,461	3,816	5,136	6,572
Data Storage [Member] | Product [Member]
Revenue
Power Supplies	1,410	1,949	3,063	4,478
Data Storage:
Power Supplies	1,410	1,949	3,063	4,478
Data Storage [Member] | Service [Member]
Revenue
Power Supplies	1,051	1,867	2,073	2,094
Data Storage:
Power Supplies	$ 1,051	$ 1,867	$ 2,073	$ 2,094