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MARKETABLE SECURITIES AND ACCRUED INTEREST (Tables)
 12 Months Ended
Dec. 31, 2018
Marketable Securities and Accrued Interest [Abstract]  
Available-for-sale Securities [Table Text Block]
The following is a summary of available-for-sale marketable securities:
 
 
 
December 31, 2017
 
 
 
Amortized
 
 
Unrealized
 
 
Unrealized
 
 
Fair
 
 
 
cost
 
 
gains
 
 
losses
 
 
Value
 
Corporate bonds:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Maturing within one year
 
$
6,883
 
 
$
-
 
 
$
(9
)
 
$
6,874
 
Maturing between one to two years
 
 
20,510
 
 
 
10
 
 
 
(45
)
 
 
20,475
 
Accrued interest
 
 
213
 
 
 
-
 
 
 
-
 
 
 
213
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
27,606
 
 
$
10
 
 
$
(54
)
 
$
27,562
 
 
 
 
December 31, 2018
 
 
 
Amortized
 
 
Unrealized
 
 
Unrealized
 
 
Fair
 
 
 
cost
 
 
gains
 
 
losses
 
 
Value
 
Corporate bonds:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Maturing within one year
 
$
19,463
 
 
$
-
 
 
$
(32
)
 
$
19,431
 
Accrued interest
 
 
171
 
 
 
-
 
 
 
-
 
 
 
171
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
$
19,634
 
 
$
-
 
 
$
(32
)
 
$
19,602