Note 3 - Inventories - Inventories (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Raw materials, parts and supplies	$ 405,000	$ 287,000
Work in progress	444,000	357,000
Finished products	1,073,000	1,009,000
	$ 1,922,000	$ 1,653,000