CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net loss	$ (737,000)	$ (925,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	21,000	148,000
Impairment loss	0	159,000
Gain on sale of property and equipment	(7,000)	0
Changes in allowance for doubtful accounts	24,000	38,000
Stock-based compensation expense	56,000	49,000
Gain on forgiveness of debt and accrued interest	(1,062,000)	0
Changes in operating assets and liabilities:
Accounts receivable	758,000	1,272,000
Inventories	(17,000)	9,000
Income tax receivable	3,000	(119,000)
Prepaid expenses and other	108,000	4,000
Accounts payable	(568,000)	(208,000)
Accrued liabilities	590,000	(389,000)
Income tax payable	8,000	9,000
Deferred revenue	520,000	210,000
Net cash provided by (used in) operating activities	(303,000)	257,000
Investing Activities:
Purchases of property and equipment	(29,000)	(32,000)
Sale of property and equipment	16,000	0
Net cash used in investing activities	(13,000)	(32,000)
Financing Activities:
Proceeds from issuance of common stock	26,000	20,000
Net cash provided by financing activities	26,000	20,000
Increase (decrease) in cash and cash equivalents	(290,000)	245,000
Cash and cash equivalents at beginning of period	7,128,000	7,510,000
Cash and cash equivalents at end of period	6,838,000	7,755,000
Supplemental disclosures for cash flow information:
Cash refunded (paid) during the period for income taxes	(1,000)	112,000
Non-cash financing activities:
Operating lease right-of-use asset obtained in exchange for lease obligation	33,000	0
Forgiveness of debt and accrued interest	$ 1,062,000	$ 0