Note 6 - Investment in Telkoor (Details Textual) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 22, 2016	Jun. 16, 2011	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Telkoor [Member]
Business Acquisition Shares Acquired		1,136,666
Business Acquisition, Percentage of Voting Interests Acquired		8.80%
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities					$ 0	$ 106,000	$ 1,100,000
Telkoor [Member]
Proceeds from Sale of Cost Method Investments	$ 90,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities						106,000
Proceeds from Sale of Cost Method Investments					$ 90,000