Note 7 - Business Segment Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Deferred Revenue, Current (in Dollars)	$ 2,459	$ 2,180
Increase (Decrease) in Accounts Receivable (in Dollars)	2,183		(4,381)
Segment Reporting Information, Revenue for Reportable Segment (in Dollars)	14,680		10,948
Waste Management Services [Member] | Approximation [Member]
Segment Reporting Information, Revenue for Reportable Segment (in Dollars)	12,000
Waste Management Services [Member]
Increase (Decrease) in Accounts Receivable (in Dollars)			2,300
Segment Reporting Information, Revenue for Reportable Segment (in Dollars)	$ 12,563	$ 9,100	$ 8,938
Consolidated Net Operating Revenues [Member]
Concentration Risk, Percentage	19.00%		9.00%
Waste Management Services Segments Net Operating Revenues [Member]
Concentration Risk, Percentage	22.00%		11.00%
Accounts Receivable [Member]
Concentration Risk, Percentage	22.50%