Note 6 - Inventories (Details) - Inventories (USD $)	Mar. 31, 2014	Dec. 31, 2013
Inventories [Abstract]
Raw materials	$ 6,180,000	$ 5,876,000
Work in process	2,245,000	2,178,000
Finished goods	6,057,000	6,086,000
	$ 14,482,000	$ 14,140,000	[1]

[1] The condensed consolidated balance sheet as of December 31, 2013 has been prepared using information from the audited consolidatedbalance sheet as of that date.