Note 6 - Inventories (Detail) - Inventories (USD $)	Mar. 31, 2013	Dec. 31, 2012
Raw materials	$ 6,920,000	$ 8,212,000
Work in process	2,896,000	3,056,000
Finished goods	6,483,000	5,896,000
	$ 16,299,000	$ 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.