Note 14 - Activity of Business Segments (Details) - Consolidated Net Sales and Long-lived Asset Information by Geographic Area (Reportable Geographical Components [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Net sales by geographic region
Consolidated sales	$ 47,649,000	$ 43,806,000
Long-lived assets by geographic region
Consolidated long-lived assets	3,315,000	3,068,000
UNITED STATES
Net sales by geographic region
Consolidated sales	45,714,000	41,644,000
Long-lived assets by geographic region
Consolidated long-lived assets	2,944,000	2,668,000
International [Member]
Net sales by geographic region
Consolidated sales	1,935,000	2,162,000
Long-lived assets by geographic region
Consolidated long-lived assets	$ 371,000	$ 400,000