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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2017
Investments [Abstract]  
Held-to-maturity Securities [Table Text Block]

Below is a summary of the amortized cost and estimated market values of the Company’s marketable securities as of December 31, 2017, and 2016. The estimated market values provided are Level 2 valuations as defined by ASC 820.
 
 
 
 
 
 
2017
 
2016
  
 
Amortized
Cost
 
Market
Value
 
Amortized
Cost
 
Market
Value
  
 
(Dollars in thousands)
Municipal bonds:
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
Current
 
$
5,970
 
 
$
5,977
 
 
$
4,601
 
 
$
4,610
 
Due from one through five years
 
 
10,260
 
 
 
10,536
 
 
 
12,133
 
 
 
12,486
 
Due from six through ten years
 
 
5,005
 
 
 
5,197
 
 
 
7,705
 
 
 
7,804
 
Due from eleven through twenty years
 
 
2,404
 
 
 
2,539
 
 
 
1,223
 
 
 
1,222
 
Total
 
$
23,639
 
 
$
24,249
 
 
$
25,662
 
 
$
26,122
 
Unrealized Gain (Loss) on Investments [Table Text Block]
The unrealized gains and losses on marketable securities at December 31, 2017 and 2016 were as follows:
 
 
 
 
 
 
2017
 
2016
  
 
Unrealized
Gains
 
Unrealized
Losses
 
Unrealized
Gains
 
Unrealized
Losses
  
 
(Dollars in thousands)
Municipal bonds
 
$
634
 
 
$
(24
) 
 
$
546
 
 
$
(86
)