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INVESTMENTS (Tables) | 12 Months Ended
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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 | )

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- Definition Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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