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Note 11 - Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities [Table Text Block] |
|  | December 31, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gains/Losses |  |  | Estimated Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 5,511 |  |  | $ | 398 |  |  | $ | 5,909 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 1,656 |  |  |  | (1 | ) |  |  | 1,655 |
Total marketable securities |  | $ | 7,167 |  |  | $ | 397 |  |  | $ | 7,564 |
|  | December 31, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gains/Losses |  |  | Estimated Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  | $ | 41,462 |  |  | $ | 46,197 |  |  | $ | 87,659 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | 2,576 |  |  |  | (200 | ) |  |  | 2,376 |
Total marketable securities |  | $ | 44,038 |  |  | $ | 45,997 |  |  | $ | 90,035 |

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