CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated Deficit)
Balance, shares at Dec. 31, 2019		1,725,000
Balance, amount at Dec. 31, 2019	$ 11,083,000	$ 16,000	$ 16,039,000	$ (4,972,000)
Issuance of common stock, net, shares		5,000
Issuance of common stock, net, amount	20,000	$ 0	20,000	0
Value of stock-based compensation	49,000	0	49,000	0
Net loss	(925,000)	$ 0	0	(925,000)
Balance, shares at Mar. 31, 2020		1,730,000
Balance, amount at Mar. 31, 2020	10,227,000	$ 16,000	16,108,000	(5,897,000)
Balance, shares at Dec. 31, 2019		1,725,000
Balance, amount at Dec. 31, 2019	11,083,000	$ 16,000	16,039,000	(4,972,000)
Net loss	(2,768,000)
Balance, shares at Jun. 30, 2020		1,734,000
Balance, amount at Jun. 30, 2020	8,443,000	$ 16,000	16,167,000	(7,740,000)
Balance, shares at Mar. 31, 2020		1,730,000
Balance, amount at Mar. 31, 2020	10,227,000	$ 16,000	16,108,000	(5,897,000)
Value of stock-based compensation	59,000	0	59,000	0
Net loss	(1,843,000)	$ 0	0	(1,843,000)
Repurchase of common stock upon vesting of restricted stock units, shares		4,000
Repurchase of common stock upon vesting of restricted stock units, amount	0	$ 0	0	0
Balance, shares at Jun. 30, 2020		1,734,000
Balance, amount at Jun. 30, 2020	8,443,000	$ 16,000	16,167,000	(7,740,000)
Balance, shares at Dec. 31, 2020		1,748,000
Balance, amount at Dec. 31, 2020	6,668,000	$ 17,000	16,238,000	(9,587,000)
Issuance of common stock, net, shares		6,000
Issuance of common stock, net, amount	26,000	$ 1,000	25,000	0
Value of stock-based compensation	56,000	0	56,000	0
Net loss	(737,000)	$ 0	0	(737,000)
Balance, shares at Mar. 31, 2021		1,754,000
Balance, amount at Mar. 31, 2021	6,013,000	$ 18,000	16,319,000	(10,324,000)
Balance, shares at Dec. 31, 2020		1,748,000
Balance, amount at Dec. 31, 2020	6,668,000	$ 17,000	16,238,000	(9,587,000)
Net loss	(1,631,000)
Balance, shares at Jun. 30, 2021		1,765,000
Balance, amount at Jun. 30, 2021	5,196,000	$ 18,000	16,396,000	(11,218,000)
Balance, shares at Mar. 31, 2021		1,754,000
Balance, amount at Mar. 31, 2021	6,013,000	$ 18,000	16,319,000	(10,324,000)
Value of stock-based compensation	86,000	0	86,000	0
Net loss	(894,000)	$ 0	0	(894,000)
Repurchase of common stock upon vesting of restricted stock units, shares		11,000
Repurchase of common stock upon vesting of restricted stock units, amount	(9,000)	$ 0	(9,000)	0
Balance, shares at Jun. 30, 2021		1,765,000
Balance, amount at Jun. 30, 2021	$ 5,196,000	$ 18,000	$ 16,396,000	$ (11,218,000)