Note 4 - Accounts Receivable and Customer Concentrations

12 Months Ended

Dec. 31, 2021

Notes to Financial Statements

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

4. ACCOUNTS RECEIVABLE AND CUSTOMER CONCENTRATIONS

At December 31, 2021 and 2020, our allowance for doubtful accounts was $0. There were no charges against the allowance for doubtful accounts in 2021 or 2020.

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
	2021			2020			2021			2020
Customer A		71	%		69	%		65	%		59	%
Customer B		6	%		10	%		8	%		6	%
Customer C		1	%		2	%		0	%		10	%