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Note 11 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Marketable Securities [Table Text Block] |
|  | December 31, 201 7 |
|  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Total |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 13,072 |  |  | $ | (1,136 | ) |  | $ | 11,936 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 1,329 |  |  |  | - |  |  |  | 1,329 |
Total marketable securities |  | $ | 14,401 |  |  | $ | (1,136 | ) |  | $ | 13,265 |
|  | December 31, 201 6 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Total |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 6,096 |  |  | $ | 406 |  |  | $ | 6,502 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 1,599 |  |  |  | - |  |  |  | 1,599 |
Total marketable securities |  | $ | 7,695 |  |  | $ | 406 |  |  | $ | 8,101 |

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