Note 5 - Long-Term Debt and Credit Facility (Details)	3 Months Ended		9 Months Ended																	9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2013 USD ($)	Sep. 30, 2013 EUR (€)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Jul. 02, 2013 USD ($)	Sep. 30, 2014 Additional [Member] USD ($)	Sep. 30, 2014 Initial [Member] USD ($)	Sep. 30, 2014 Wasco Energy [Member] USD ($)	Sep. 30, 2014 Bayou Wasco [Member] USD ($)	Sep. 30, 2014 Initial [Member] USD ($)	Sep. 30, 2014 Additional [Member] USD ($)	Sep. 30, 2014 Insurance Carriers Collateral [Member] USD ($)	Sep. 30, 2014 Work Performance Obligations [Member] USD ($)	Sep. 30, 2014 BPPC [Member] USD ($)	Sep. 30, 2014 2013 Credit Facility [Member] USD ($)	Dec. 31, 2013 2013 Credit Facility [Member] USD ($)	Jul. 31, 2013 2013 Credit Facility [Member] USD ($)	Jul. 02, 2013 2013 Credit Facility [Member] USD ($)	Sep. 30, 2014 2013 Credit Facility [Member] Minimum [Member]	Sep. 30, 2014 2013 Credit Facility [Member] Maximum [Member]	Sep. 30, 2013 Brinderson LP [Member] USD ($)	Sep. 30, 2014 Brinderson LP [Member] USD ($)	Jul. 02, 2013 Brinderson LP [Member] USD ($)	Jul. 31, 2013 2013 Interest Rate Swap [Member] USD ($)
Note 5 - Long-Term Debt and Credit Facility [Line Items]
Debt Instrument, Face Amount																			$ 650,000,000
Line of Credit Facility, Maximum Borrowing Capacity																			300,000,000
Secured Debt																325,900,000	341,300,000		350,000,000
Debt Instrument, Basis Spread on Variable Rate																				1.25%	2.25%
Debt Instrument, Interest Rate at Period End																2.10%
Line of Credit Facility, Amount Outstanding																45,500,000	35,500,000
Proceeds from Lines of Credit			10,000,000	0
Total consideration recorded	18,300,000	14,000,000	0	(18,300,000)																		147,600,000	147,605,000
Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds																								150,000,000
Credit Facility, Retired Amount						232,300,000
Business Combination, Consideration Paid						7,000,000
Other Loans Payable			100,000		100,000
Due from Joint Ventures							2,600,000	14,000,000	8,100,000	16,600,000	8,000,000	6,200,000			14,200,000
Other Long-term Debt			4,500,000		11,700,000
Letters of Credit Outstanding, Amount			20,700,000										11,400,000	9,300,000
Long-term Debt, Fair Value			383,900,000		380,100,000
Derivative Asset, Notional Amount																									175,000,000
Derivative, Variable Interest Rate			2.19%
Derivative, Amount of Hedged Item																		175,000,000
Derivative, Fixed Interest Rate Percentage			0.87%
Credit Facility Maximum Consolidated Leverage Ratio			3.75
CreditFacilityMinimumConsolidatedLeverageRatio			3.50
Credit Facility Actual Consolidated Leverage Ratio			2.89
Line of Credit Facility, Remaining Borrowing Capacity			$ 80,400,000
Credit Facility Minimum Consolidated Fixed Charge Ratio			1.25
Credit Facility Actual Consolidated Fixed Charge Ratio			1.28