Note 2 - Discontinued Operations (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 89,167,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	33,974,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	22,117,000
Environmental Services [Member]
Escrow Deposit	8,000,000	8,000,000	8,000,000
Proceeds from Divestiture of Businesses	100,000,000
Proceeds from Divestiture of Businesses, Net of Cash Divested	89,800,000
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	34,000,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	22,100,000
Environmental Services [Member] | Released 18 Months From Closing Date [Member]
Escrow Deposit	4,000,000
Environmental Services [Member] | Released 9 Months From Closing Date Member
Escrow Deposit	$ 4,000,000