Note 5 - Accounts Receivable, Notes Receivable and Customer Concentrations (Tables)

12 Months Ended

Dec. 31, 2012

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Revenue						Accounts Receivable
	2012			2011			2012			2011
ChemFree
Customer A		13	%		11	%		13	%		13	%
Customer B		7	%		8	%		14	%		16	%
Customer C		27	%		27	%		20	%		28	%
Customer D		10	%		9	%		12	%		12	%