SUMMARY OF ACCOUNTING POLICIES - Basic and diluted earnings per common share (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 4,911,000	$ 856,000
Denominator:
Denominator for basic income per share-weighted average common shares outstanding	3,207,000	3,628,000
Denominator for diluted income per share-adjusted weighted average common shares and assumed conversions	3,262,000	3,728,000