STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)	Total
Beginning balance, shares at Dec. 31, 2018	1,692,000
Beginning balance, amount at Dec. 31, 2018	$ 118,000	$ 15,442,000	$ 760,000	$ 16,320,000
Issuance of common stock, net, shares	15,000
Issuance of common stock, net, amount	$ 1,000	107,000		108,000
Vesting of restricted stock units offset by repurchase of common stock upon vesting of restricted stock units and awards, shares	(3,000)
Vesting of restricted stock units offset by repurchase of common stock upon vesting of restricted stock units and awards, amount	$ 2,000	(37,000)		(35,000)
Value of stock-based compensation		422,000		422,000
Restricted stock award issuance, shares	21,000
Restricted stock award issuance, amount				0
Net loss			(5,021,000)	(5,021,000)
Ending balance, shares at Dec. 31, 2019	1,725,000
Ending balance, amount at Dec. 31, 2019	$ 121,000	15,934,000	(4,261,000)	11,794,000
Issuance of common stock, net, shares	5,000
Issuance of common stock, net, amount		20,000		20,000
Vesting of restricted stock units offset by repurchase of common stock upon vesting of restricted stock units and awards, shares	16,000
Vesting of restricted stock units offset by repurchase of common stock upon vesting of restricted stock units and awards, amount	$ 1,000	(2,000)		(1,000)
Value of stock-based compensation		172,000		172,000
Common stock issued for accrued liabilities		9,000		9,000
Restricted stock award issuance, shares	2,000
Restricted stock award issuance, amount				0
Net loss			(4,300,000)	(4,300,000)
Ending balance, shares at Dec. 31, 2020	1,748,000
Ending balance, amount at Dec. 31, 2020	$ 122,000	$ 16,133,000	$ (8,561,000)	$ 7,694,000