Note 5 - Concentration of Revenue (Detail) - Concentration of Revenue	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
ChemFree Customer A [Member]
Percentage of consolidated revenue	13.00%	13.00%
ChemFree Customer B [Member]
Percentage of consolidated revenue	30.00%	29.00%
ChemFree Customer C [Member]
Percentage of consolidated revenue	10.00%	10.00%