Note 11 - Segment Information - Income (Loss) Before Taxes by Segment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
(Loss) before Taxes
Loss before taxes	$ (1,865)	$ (1,210)	$ (2,606)	$ (1,308)
Power Supplies [Member]
(Loss) before Taxes
Loss before taxes	(524)	(545)	(833)	(714)
Data Storage [Member]
(Loss) before Taxes
Loss before taxes	$ (1,341)	$ (665)	$ (1,773)	$ (594)

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration