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Note 1 - Business Summary and Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended			9 Months Ended
	Aug. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2015 USD ($) $ / shares	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($) $ / shares	Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2014 USD ($) $ / shares	Dec. 31, 2014
Minimum [Member] | Notes Payable for Transportation and Construction Equipment [Member]
Debt Instrument, Term						3 years
Minimum [Member]
Warranty Term						1 year
Revenue Recognition Percentage of Completion Range						1 year
Ownership Interest in Joint Venture						50.00%
Maximum [Member] | Notes Payable for Transportation and Construction Equipment [Member]
Debt Instrument, Term						5 years
Maximum [Member]
Warranty Term						2 years
Revenue Recognition Percentage of Completion Range						3 years
Other Operating Income (Expense) [Member]
Gain (Loss) on Sale of Long-term Contract	$ (1.4)
Notes Payable for Transportation and Construction Equipment [Member]
Notes Payable, Noncurrent			$ 2.5			$ 2.5
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum						3.12%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum						6.29%
Change in Estimated Construction Gross Profit Before Tax			$ 1.1		$ 4.5	$ (12.3)	$ 0.4
Estimated Change in Construction Gross Profit Per Diluted Share | $ / shares			$ (0.06)		$ (0.24)	$ (0.64)	$ 0.02
Proceeds from Sale of Long-term Contract	$ 7.1
Contract Receivable Discounted Percentage						4.25%
Interest Revenue (Expense), Net			$ 0.1		$ 0.1	$ 0.2	$ 0.3
Mortgage Outstanding, Number								1
Repayments of Secured Debt		$ 0.1
Out of Period Adjustment to Revenue				$ (2.8)

X

- Definition

Represents the change in net estimated gross profit before tax.

+ References

No definition available.

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- Definition

Represents the contract receivable discounted percentage.

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- Definition

Represents the amount of the estimated change in construction gross profit per diluted share.

+ References

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- Definition

Represents the gain (loss) on sale of long-term contract.

+ References

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- Definition

Represents the number of mortgages outstanding.

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- Definition

Adjustment made to revenue in the current period related to out of period corrections.

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- Definition

Represents the ownership interest in joint venture.

+ References

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X

- Definition

Represents the proceeds from the sale of long-term contract.

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- Definition

Represents the length of time the Company's contracts generally take to complete.

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No definition available.

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- Definition

Represents the warranty term.

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

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-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount of interest revenue (income derived from investments in debt securities and on cash and cash equivalents) net of interest expense (cost of borrowed funds accounted for as interest).

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- Definition

Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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-Glossary Financing Activities



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