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Note 1 - Summary of Business and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Notes Tables |
Schedule of Property Plant and Equipment, Useful Lives [Table Text Block] |
| Buildings (in years) |  | 39 |
| Construction equipment (in years) | 5 | - | 15
| Land improvements (in years) | 5 | - | 15
| Office furniture and fixtures (in years) | 3 | - | 10
| Leasehold improvements (in years or lease period, if shorter) | 3 | - | 10
| Transportation equipment (in years) |  | 5 |

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