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

12 Months Ended

Dec. 31, 2013

Receivables [Abstract]

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

	Revenue						Accounts Receivable
	2013			2012			2013			2012
ChemFree
Customer A		18	%		13	%		17	%		13	%
Customer B		8	%		7	%		15	%		14	%
Customer C		21	%		27	%		18	%		20	%
Customer D		7	%		10	%		5	%		12	%