SUMMARY OF ACCOUNTING POLICIES - Basic and diluted earnings per common share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Numerator for basic and diluted (loss) income per common share:
Net income (loss)	$ 2,290,000	$ (4,954,000)
Denominator:
Denominator for basic income (loss) per share-weighted average common shares outstanding	3,178,000	3,149,000
Dilutive securities (1)	14,000
Denominator for diluted income (loss) per share-adjusted weighted average common shares and assumed conversions	3,192,000	3,149,000