Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Details)

v3.10.0.1
FAIR VALUE MEASUREMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis $ 77,169 $ 73,633
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax (23) (25)
Available-for-sale Securities 77,146 73,608
Municipal Bonds and Notes [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 7,176 13,320
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax (1) (1)
Available-for-sale Securities 7,175 13,319
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 49,900 49,432
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax (22) (24)
Available-for-sale Securities 49,878 49,408
Financial Institution Instruments [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 20,093 10,881
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 0 0
Available-for-sale Securities $ 20,093 $ 10,881