Note 11 - Segment Information - Revenue by Primary Geographic Operating Region (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Power Supplies	$ 4,924	$ 9,417	$ 10,978	$ 12,902
Power Supplies [Member]
Power Supplies	2,463	5,601	5,842	6,330
Data Storage [Member]
Power Supplies	2,461	3,816	5,136	6,572
North America [Member]
Power Supplies	2,860	5,077	5,454	5,929
North America [Member] | Power Supplies [Member]
Power Supplies	1,001	2,157	2,042	2,185
North America [Member] | Data Storage [Member]
Power Supplies	1,859	2,920	3,412	3,744
Europe [Member]
Power Supplies	713	1,955	1,820	2,195
Europe [Member] | Power Supplies [Member]
Power Supplies	487	1,474	1,149	1,333
Europe [Member] | Data Storage [Member]
Power Supplies	226	481	671	862
Asia Pacific [Member]
Power Supplies	1,211	2,293	3,228	4,169
Asia Pacific [Member] | Power Supplies [Member]
Power Supplies	975	1,970	2,651	2,812
Asia Pacific [Member] | Data Storage [Member]
Power Supplies	236	323	578	1,357
Other Geographic Areas [Member]
Power Supplies	140	92	476	609
Other Geographic Areas [Member] | Power Supplies [Member]
Power Supplies
Other Geographic Areas [Member] | Data Storage [Member]
Power Supplies	$ 140	$ 92	$ 476	$ 609