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INVESTMENTS | 12 Months Ended
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Dec. 31, 2017
Investments [Abstract] |
Cost and Equity Method Investments Disclosure [Text Block] | ## 4. INVESTMENTS 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 |
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 | )
At each reporting date, the Company reviews its investments to determine whether a decline in fair value below the amortized cost basis is other-than-temporary. To determine whether a decline in value is other-than-temporary, the Company considers all available evidence, including the issuer’s financial condition, the severity and duration of the decline in fair value, and the Company’s intent and ability to hold the investment for a reasonable period of time sufficient for any forecasted recovery. If a decline in value is deemed other-than-temporary, the Company records a reduction in the carrying value to the estimated fair value. The Company determined that no other-than-temporary impairment exists for the years ended December 31, 2017, 2016, and 2015.

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- Definition The entire disclosure for cost method and equity method investments included basis, impairment losses, recognized or unrecognized gains (losses). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2197087 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -URI http://asc.fasb.org/topic&trid=2196965 + Details
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