CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($)	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Balance, shares at Dec. 31, 2021		1,782,000
Balance, amount at Dec. 31, 2021	$ 3,193,000	$ 18,000	$ 16,296,000	$ (13,121,000)
Issuance of common stock, net, shares		4,000
Issuance of common stock, net, amount	28,000	$ 0	28,000	0
Value of stock-based compensation	30,000	0	30,000	0
Net income	62,000	$ 0	0	62,000
Balance, shares at Mar. 31, 2022		1,786,000
Balance, amount at Mar. 31, 2022	3,313,000	$ 18,000	16,354,000	(13,059,000)
Issuance of common stock, net, shares		1,000
Issuance of common stock, net, amount	11,000	$ 0	11,000	0
Value of stock-based compensation	29,000	0	29,000	0
Net income	(1,084,000)	$ 0	0	(1,084,000)
Issuance of common stock upon vesting of restricted stock units, shares		6,000
Issuance of common stock upon vesting of restricted stock units, amount	0	$ 0	0	0
Balance, shares at Jun. 30, 2022		1,793,000
Balance, amount at Jun. 30, 2022	2,269,000	$ 18,000	16,394,000	(14,143,000)
Value of stock-based compensation	32,000	0	32,000	0
Net income	11,801,000	$ 0	0	11,801,000
Issuance of common stock upon vesting of restricted stock units, shares		3,000
Issuance of common stock upon vesting of restricted stock units, amount	0	$ 0	0	0
Balance, shares at Sep. 30, 2022		1,796,000
Balance, amount at Sep. 30, 2022	14,102,000	$ 18,000	16,426,000	(2,342,000)
Balance, shares at Dec. 31, 2022		1,797,000
Balance, amount at Dec. 31, 2022	13,401,000	$ 18,000	16,458,000	(3,075,000)
Issuance of common stock, net, shares		1,000
Issuance of common stock, net, amount	8,000	$ 0	8,000	0
Value of stock-based compensation	22,000	0	22,000	0
Net income	1,648,000	$ 0	0	1,648,000
Balance, shares at Mar. 31, 2023		1,798,000
Balance, amount at Mar. 31, 2023	15,079,000	$ 18,000	16,488,000	(1,427,000)
Value of stock-based compensation	14,000	0	14,000	0
Net income	(36,000)	$ 0	0	(36,000)
Balance, shares at Jun. 30, 2023		1,798,000
Balance, amount at Jun. 30, 2023	15,057,000	$ 18,000	16,502,000	(1,463,000)
Issuance of common stock, net, shares		22,000
Issuance of common stock, net, amount	149,000	$ 0	149,000	0
Value of stock-based compensation	7,000	0	7,000	0
Net income	1,126,000	$ 0	0	1,126,000
Issuance of common stock upon vesting of restricted stock units, shares		6,000
Issuance of common stock upon vesting of restricted stock units, amount	0	$ 0	0	0
Repurchase of common stock, shares		(75,000)
Repurchase of common stock, amount	(437,000)	$ 0	(437,000)	0
Balance, shares at Sep. 30, 2023		1,751,000
Balance, amount at Sep. 30, 2023	$ 15,902,000	$ 18,000	$ 16,221,000	$ (337,000)