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Note 4 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Components of Agreement Obligation [Table Text Block] |
|  | As of December 31,
|  | 2016 |  | 2015
Members’ interest subject to mandatory redemption |  | $ | 40,000 |  |  | $ | 40,000 |
Net accumulated earnings |  |  | 5,230 |  |  |  | 10,438 |
Total liability |  | $ | 45,230 |  |  | $ | 50,438 |
Schedule of Changes in Noncontrolling Interests and Joint Ventures [Table Text Block] |
|  | Years Ended December 31,
|  | 2016 |  | 2015 |  | 2014
Balance, beginning of period |  | $ | (91 | ) |  | $ | 7,462 |  |  | $ | 4,097 |
Net income attributable to noncontrolling interest included in equity |  |  | 1,826 |  |  |  | 3,216 |  |  |  | 4,556 |
Change due to amendment |  |  | -- |  |  |  | (7,367 | ) |  |  | -- |
Distributions to noncontrolling interests owners |  |  | (1,079 | ) |  |  | (3,402 | ) |  |  | (1,191 | )
Balance, end of period |  | $ | 656 |  |  | $ | (91 | ) |  | $ | 7,462 |

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