Note 4 - Property and Equipment (Detail) - Property and Equipment (Parentheticals)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Equipment [Member] | Minimum [Member]
Property and equipment, useful life	3 years	3 years
Equipment [Member] | Maximum [Member]
Property and equipment, useful life	15 years	15 years
Tooling [Member] | Minimum [Member]
Property and equipment, useful life	2 years	2 years
Tooling [Member] | Maximum [Member]
Property and equipment, useful life	5 years	5 years
Furniture and Fixtures [Member]
Property and equipment, useful life	5 years	5 years
Software [Member]
Property and equipment, useful life	3 years	3 years