Note 6 - Inventories (Details) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Raw materials	$ 7,327,000	$ 6,436,000
Work in process	4,719,000	4,834,000
Finished goods	5,815,000	5,274,000
	$ 17,861,000	$ 16,544,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2014 has been prepared using information from the audited consolidated balance sheet as of that date.