Note 6 - Concentration of Revenue (Details) - Concentration of Revenue	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
ChemFree Customer A [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenue	20.00%	29.00%	25.00%	29.00%
ChemFree Customer B [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenue	12.00%	14.00%	12.00%	14.00%
ChemFree Customer C [Member]
Concentration Risk [Line Items]
Percentage of consolidated revenue	11.00%		11.00%