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Note 4 - Subsidiaries and Joint Ventures with Noncontrolling Owners' Interests (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 27, 2015
Adjustments to Additional Paid in Capital, Revaluation of Non-controlling Interest Put/Call Liability |  | $ (7,367,000) |  |
Stockholders' Equity Attributable to Noncontrolling Interest | $ 656,000 | (91,000) |  |
Myers [Member] |  |  |  |
Adjustments to Additional Paid in Capital, Revaluation of Non-controlling Interest Put/Call Liability |  | 18,800,000 |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  | $ 7,400,000
Myers [Member] |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 50.00% |  |  |
Undistributed Earnings, Basic |  | 500,000 | $ 0 |
Myers [Member] | Upon Death [Member] |  |  |  |
Income (Loss) from Subsidiaries, before Tax | $ 8,900,000 | 4,200,000 | 2,100,000 |
Subsidiaries [Member] | Myers [Member] |  |  |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) |  | $ (7,367,000) |  |

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