Note 1 - Business Summary and Significant Accounting Policies (Details Textual) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Minimum [Member]
Ownership Interest in Joint Venture			50.00%
Revenue Recognition Percentage of Completion Range			1 year
Warranty Term			1 year
Maximum [Member]
Revenue Recognition Percentage of Completion Range			3 years
Warranty Term			2 years
Operating Income (Loss) [Member]
Estimated Construction Gross (Loss) Profit, Before Tax	$ (0.6)	$ (1.1)	$ (1.1)	$ (12.3)
Texas [Member]
Number of Projects with Claims	2		2
Costs and Estimated Earnings in Excess of Billings [Member]
Unapproved Change Orders, Amount	$ 2.4		$ 2.4		$ 1.6
Contracts Receivable, Claims and Uncertain Amounts	9.1		9.1		$ 5.2
Contracts Receivable, Unpaid Project Contract Price	3.9		$ 3.9
Ownership Interest in Joint Venture			50.00%
Contracts Receivable, Unpaid Project Contract Price	$ 3.9		$ 3.9