Note 6 - Accounts Receivable, Notes Receivable and Customer Concentrations

12 Months Ended

Dec. 31, 2011

Loans, Notes, Trade and Other Receivables Disclosure [Text Block]

6.     ACCOUNTS RECEIVABLE, NOTES RECEIVABLE AND CUSTOMER CONCENTRATIONS

At December 31, 2011 and 2010, our allowance for doubtful accounts amounted to $30,000 and $8,000, respectively. Net charges against the allowance for doubtful accounts were $8,000 and $2,000 in 2011 and 2010, respectively.

The following table indicates the percentage of consolidated revenue and year-end accounts receivable represented by each customer that represented more than 10 percent of consolidated revenue or year-end accounts receivable.

	Revenue						Accounts Receivable
	2011			2010			2011			2010
ChemFree
Customer A		11	%		12	%		13	%		12	%
Customer B		8	%		7	%		16	%		26	%
Customer C		27	%		32	%		28	%		13	%
Customer D		9	%		10	%		12	%		14	%