Note 3 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash and Cash Equivalents, at Carrying Value	$ 996	$ 1,241	$ 2,110
Allowance for Doubtful Accounts Receivable	32	0
Inventory Write-down	84	9
Standard and Extended Product Warranty Accrual	86	94
Unrecognized Tax Benefits	0	0
Available-for-sale Securities	1,036	90
Amortization of Debt Discount (Premium)	$ 2
Class of Warrant or Right, Outstanding	317,460
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.01
Impairment of Long-Lived Assets Held-for-use	$ 0	0
Avalanche International Corp. [Member]
Available-for-sale Securities	952
Available-for-sale Securities, Equity Securities	84
Telkoor [Member]
Available-for-sale Securities		90	$ 207
Available-for-sale Securities, Current		90
Minimum [Member]
Warranty Period	1 year
Maximum [Member]
Warranty Period	2 years
UNITED KINGDOM
Cash and Cash Equivalents, at Carrying Value	$ 736	$ 868