Note 10 - Segment Information - Total Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Cash and cash equivalents	$ 4,831	$ 4,698
Accounts receivables, net	2,046	1,802
Inventories, net	2,718	1,564
Property and equipment, net	120	172
Other assets	119	68
Total Assets	10,122	8,567
Restricted cash	100	100
Prepaid expenses and other current assets	188	163
Total Assets	10,122	8,567
Power Supplies [Member]
Cash and cash equivalents	255	721
Accounts receivables, net	1,248	831
Inventories, net	1,465	725
Property and equipment, net	51	64
Other assets	98	8
Total Assets	3,117	2,349
Total Assets	3,117	2,349
Data Storage [Member]
Cash and cash equivalents	4,576	3,977
Accounts receivables, net	798	971
Inventories, net	1,253	839
Property and equipment, net	69	108
Other assets	29	60
Total Assets	7,005	6,218
Restricted cash	100	100
Prepaid expenses and other current assets	180	163
Total Assets	$ 7,005	$ 6,218