Note 5 - Accounts Receivable, Notes Receivable and Customer Concentrations (Detail) - Concentration of Revenue	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
ChemFree Customer A [Member] | Customer Concentration Risk [Member]
Concentration Risk	13.00%	11.00%
ChemFree Customer A [Member] | Credit Concentration Risk [Member]
Concentration Risk	13.00%	13.00%
ChemFree Customer B [Member] | Customer Concentration Risk [Member]
Concentration Risk	7.00%	8.00%
ChemFree Customer B [Member] | Credit Concentration Risk [Member]
Concentration Risk	14.00%	16.00%
ChemFree Customer C [Member] | Customer Concentration Risk [Member]
Concentration Risk	27.00%	27.00%
ChemFree Customer C [Member] | Credit Concentration Risk [Member]
Concentration Risk	20.00%	28.00%
ChemFree Customer D [Member] | Customer Concentration Risk [Member]
Concentration Risk	10.00%	9.00%
ChemFree Customer D [Member] | Credit Concentration Risk [Member]
Concentration Risk	12.00%	12.00%