Note 6 - Inventories (Details) - Inventories (USD $)	Sep. 30, 2013	Dec. 31, 2012
Inventories [Abstract]
Raw materials	$ 5,590,000	$ 8,212,000
Work in process	2,628,000	3,056,000
Finished goods	5,423,000	5,896,000
	$ 13,641,000	$ 17,164,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2012 has been prepared using information from the audited consolidated balance sheet as of that date.