BUSINESS AND SUMMARY OF ACCOUNTING POLICIES - Maturity analysis of the annual undiscounted cash flows (Details)	Mar. 31, 2020 USD ($)
Operating lease liabilities
2020 (excluding the three months ended March 31, 2020)	$ 674,000
2021	825,000
2022	736,000
2023	634,000
2024	368,000
Thereafter	1,053,000
Total operating lease payments	4,290,000
Less imputed interest	(524,000)
Total operating lease liabilities	$ 3,766,000
Weighted-average remaining lease term	6 years 7 months 6 days
Weighted-average discount rate	4.42%