Note 6 - Intangible Asset, Net (Details Textual) - USD ($)		12 Months Ended
	Aug. 25, 2010	Dec. 31, 2016	Dec. 31, 2015
Amortization		$ 0	$ 66,000
Intellectual Property [Member]
Finite-Lived Intangible Asset, Useful Life		5 years
Telkoor Power Supplies [Member]
Payments to Acquire Intangible Assets	$ 480,000
Royalty Fee	15.00%
Training and Techinical Support Period	5 years
IP Reduction Period	4 years
Shortfall Balance			$ 86,000
Proceeds from Royalty Payment Refunds		$ 40,000