Note 2 - Accounting Policies (Details) - Financial Data for Investments in Affiliated Companies (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Financial Data for Investments in Affiliated Companies [Abstract]
Current assets	$ 10,220		$ 32,752
Non-current assets	10,022		22,495
Current liabilities	1,743		16,006
Non-current liabilities	0		484
income statement data
Revenue	89,157	[1]	141,233	134,716
Gross profit	27,336	[1]	40,342	29,651
Net income	17,946	[1]	22,009	12,512
Equity in earnings of affiliated companies	$ 5,159	[1]	$ 6,359	$ 3,471

[1] Includes the financial data of Insituform-Germany through the date of its sale in June 2013.