Note 7 - Concentration of Revenue (Detail) - Concentration of Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
ChemFree Customer A [Member]
Percentage of consolidated revenue	29.00%	27.00%	29.00%	30.00%
ChemFree Customer B [Member]
Percentage of consolidated revenue	14.00%	13.00%	14.00%	12.00%