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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Investments [Abstract]  
Debt Securities, Held-to-maturity [Table Text Block]
Below is a summary of the amortized cost and estimated market values of the Company’s marketable securities at December 31, 2018 and 2017. The estimated market values provided are Level 2 valuations as defined by ASC 820.
 
 
 
2018
 
 
2017
 
 
 
Amortized Cost
 
 
Market Value
 
 
Amortized Cost
 
 
Market Value
 
 
 
(Dollars in thousands)
 
Municipal bonds:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Current
 
$
1,525
 
 
$
1,532
 
 
$
5,970
 
 
$
5,977
 
Due from one through five years
 
 
9,752
 
 
 
9,861
 
 
 
10,260
 
 
 
10,536
 
Due from six through ten years
 
 
6,239
 
 
 
6,433
 
 
 
5,005
 
 
 
5,197
 
Due from eleven through twenty years
 
 
2,711
 
 
 
2,713
 
 
 
2,404
 
 
 
2,539
 
     Total
 
$
20,227
 
 
$
20,539
 
 
$
23,639
 
 
$
24,249
 
Unrealized Gain (Loss) on Investments [Table Text Block]
The unrealized gains and losses on marketable securities at December 31, 2018 and 2017 were as follows:
 
 
 
2018
 
 
2017
 
 
 
Unrealized

Gains
 
 
Unrealized

Losses
 
 
Unrealized

Gains
 
 
Unrealized

Losses
 
 
 
(Dollars in thousands)
 
Municipal bonds
 
$
388
 
 
$
(76
)
 
$
634
 
 
$
(24
)