Note 5 - Accounts Receivable and Customer Concentrations

12 Months Ended

Dec. 31, 2017

Notes to Financial Statements

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

5. ACCOUNTS RECEIVABLE and customer concentrations

At

December 31,

201

7

and

2016,

our allowance for doubtful accounts amounted to

$0

and

$15,000

respectively. Net charges against the allowance for doubtful accounts were

$15,000

and

$0

in

2017

and

2016,

respectively.

The following table indicates the percentage of consolidated revenue from continuing operations and year-end accounts receivable represented by each customer that represented more than

10

percent of consolidated revenue from continuing operations or year-end accounts receivable.

	Revenue						Accounts Receivable
	2017			2016			2017			2016
Customer A		9.3	%		13.2	%		15.2	%		14.2	%
Customer B		26.6	%		28.5	%		25.8	%		52.2	%
Customer C		11.9	%		10.3	%		9.0	%		5.2	%
Customer D		11.3	%		6.4	%		7.6	%		5.9	%