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Note 3 - Marketable Equity Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Marketable Securities [Table Text Block] |
|  | 2015 |  |  | 2014 |
|  | (in thousands) |
Available-for-sale securities |  |  |  |  |  |  |  |
Fair market value |  | $ | 24,575 |  |  | $ | 24,592 |
Cost |  |  | 16,015 |  |  |  | 14,272 |
Unrealized gain |  | $ | 8,560 |  |  | $ | 10,320 |
Trading securities |  |  |  |  |  |  |  |
Fair market value |  | $ | - |  |  | $ | 303 |
Cost |  |  | - |  |  |  | 157 |
Unrealized gain |  | $ | - |  |  | $ | 146 |
Total |  |  |  |  |  |  |  |
Fair market value |  | $ | 24,575 |  |  | $ | 24,895 |
Cost |  |  | 16,015 |  |  |  | 14,429 |
Unrealized gain |  | $ | 8,560 |  |  | $ | 10,466 |
Unrealized Gain (Loss) on Investments [Table Text Block] |
|  | 2015 |  |  | 2014 |
|  | (in thousands) |
Available-for-sale securities |  |  |  |  |  |  |  |
Gross unrealized gains |  | $ | 9,893 |  |  | $ | 10,710 |
Gross unrealized losses |  |  | 1,333 |  |  |  | 390 |
Net unrealized gains |  | $ | 8,560 |  |  | $ | 10,320 |
Realized Gain (Loss) on Investments [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (in thousands) |
Trading securities |  |  |  |  |  |  |  |  |  |  |  |
Recognized gain (loss) at beginning of period |  | $ | 146 |  |  | $ | 8 |  |  | $ | (26 | )
Recognized gain at end of period |  |  | - |  |  |  | 146 |  |  |  | 8 |
Securities transferred from trading to available-for-sale |  |  | (81 | ) |  |  | - |  |  |  | - |
Change in net recognized gain (loss) |  | $ | (65 | ) |  | $ | 138 |  |  | $ | 34 |
Schedule of Realized Gain (Loss) [Table Text Block] |
|  | 2015 |  |  | 2014 |  |  | 2013 |
|  | (in thousands) |
Realized gains |  |  |  |  |  |  |  |  |  |  |  |
Sale proceeds |  | $ | 1,500 |  |  | $ | 1,720 |  |  | $ | 857 |
Cost of securities sold |  |  | 434 |  |  |  | 818 |  |  |  | 290 |
Realized gains |  | $ | 1,066 |  |  | $ | 902 |  |  | $ | 567 |
Realized gains, net of taxes |  | $ | 654 |  |  | $ | 546 |  |  | $ | 346 |

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