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Note 1 - Business Summary and Significant Accounting Policies (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Jun. 30, 2015 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Dec. 31, 2014 USD ($)
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Change in Estimated Construction Gross Profit Before Tax |  | $ 0.9 | $ (2.3) | $ (11.2) | $ 5.0 |
Estimated Change in Construction Gross Profit Per Diluted Share (in Dollars per share) | $ / shares |  | $ 0.04 | $ 0.12 | $ (0.59) | $ 0.27 |
Contract Receivable Discounted Percentage |  |  |  | 4.25% |  |
Interest Revenue (Expense), Net |  | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.2 |
Mortgage Outstanding, Number |  |  |  |  |  | 1
Secured Long-term Debt, Noncurrent |  |  |  |  |  | $ 0.1
Repayments of Secured Debt | $ 0.1 |  |  |  |  |
Out of Period Adjustment |  | 2.8 |  | 2.8 |  |
Notes Payable for Transportation and Construction Equipment [Member] |  |  |  |  |  |
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Notes Payable, Noncurrent | $ 2.8 | $ 2.8 |  | $ 2.8 |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum |  |  |  | 3.12% |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  |  |  | 6.29% |  |
Minimum [Member] |  |  |  |  |  |
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Ownership Interest In Joint Venture |  |  |  | 50.00% |  |
Revenue Recognition Percentage of Completion Range |  |  |  | 12 months |  |
Warranty Term |  |  |  | 1 year |  |
Minimum [Member] | Notes Payable for Transportation and Construction Equipment [Member] |  |  |  |  |  |
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 3 years |  |
Maximum [Member] |  |  |  |  |  |
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Revenue Recognition Percentage of Completion Range |  |  |  | 36 months |  |
Warranty Term |  |  |  | 2 years |  |
Maximum [Member] | Notes Payable for Transportation and Construction Equipment [Member] |  |  |  |  |  |
Note 1 - Business Summary and Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |

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