CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($)	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Retained Earnings (Accumulated Deficit)
Balance, amount at Dec. 31, 2019	$ 20,821,000	$ 52,000	$ 6,242,000	$ (102,000)	$ 14,629,000
Vesting of restricted stock	0	0	0	0	0
Net income (loss)	(38,000)	0	0	0	(38,000)
Balance, amount at Mar. 31, 2020	20,783,000	52,000	6,242,000	(102,000)	14,591,000
Balance, amount at Dec. 31, 2019	20,821,000	52,000	6,242,000	(102,000)	14,629,000
Net income (loss)	1,952,000
Balance, amount at Sep. 30, 2020	22,773,000	52,000	6,242,000	(102,000)	16,581,000
Balance, amount at Mar. 31, 2020	20,783,000	52,000	6,242,000	(102,000)	14,591,000
Vesting of restricted stock	0	0	0	0	0
Net income (loss)	441,000	0	0	0	441,000
Balance, amount at Jun. 30, 2020	21,224,000	52,000	6,242,000	(102,000)	15,032,000
Vesting of restricted stock	0	0	0	0	0
Net income (loss)	1,549,000	0	0	0	1,549,000
Balance, amount at Sep. 30, 2020	22,773,000	52,000	6,242,000	(102,000)	16,581,000
Balance, amount at Dec. 31, 2020	23,649,000	52,000	6,405,000	(102,000)	17,294,000
Vesting of restricted stock	41,000	0	41,000	0	0
Net income (loss)	2,867,000	0	0	0	2,867,000
Balance, amount at Mar. 31, 2021	26,557,000	52,000	6,446,000	(102,000)	20,161,000
Balance, amount at Dec. 31, 2020	23,649,000	52,000	6,405,000	(102,000)	17,294,000
Net income (loss)	7,546,000
Balance, amount at Sep. 30, 2021	31,454,000	53,000	6,663,000	(102,000)	24,840,000
Balance, amount at Mar. 31, 2021	26,557,000	52,000	6,446,000	(102,000)	20,161,000
Vesting of restricted stock	131,000	1,000	130,000	0	0
Net income (loss)	985,000	0	0	0	985,000
Balance, amount at Jun. 30, 2021	27,673,000	53,000	6,576,000	(102,000)	21,146,000
Vesting of restricted stock	87,000	0	87,000	0	0
Net income (loss)	3,694,000	0	0	0	3,694,000
Balance, amount at Sep. 30, 2021	$ 31,454,000	$ 53,000	$ 6,663,000	$ (102,000)	$ 24,840,000