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LEASES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Lessee, Lease, Description [Line Items]      
Operating lease, weighted average remaining lease term 9 years 5 days    
Operating lease, weighted average discount rate 3.27%    
Operating lease, rent expense $ 200    
Finance lease, weighted average remaining lease term 12 years 9 months 19 days    
Finance lease, weighted average discount rate 3.35%    
Director      
Lessee, Lease, Description [Line Items]      
Operating lease, rent expense $ 24 $ 24  
1365 New Scotland Road, Slingerlands, New York | Director      
Lessee, Lease, Description [Line Items]      
Operating lease, rent expense 12 $ 12  
Operating lease, monthly rent expense $ 4    
2 Rush Street, Schenectady, New York | Director      
Lessee, Lease, Description [Line Items]      
Operating lease, monthly rent expense     $ 8