Note 10 - Equity Method Investment (Detail) (USD $)	12 Months Ended							3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Transport Enterprise Leasing, LLC [Member]	Dec. 31, 2011 Transport Enterprise Leasing, LLC [Member]	May 31, 2011 Transport Enterprise Leasing, LLC [Member]	May 31, 2016 Scenario, Forecast [Member]	Dec. 31, 2012 Maximum [Member]	Jun. 30, 2012 Earnout [Member]	Dec. 31, 2012 Earnout [Member]	Dec. 31, 2011 Earnout [Member]
Equity Method Investment, Ownership Percentage			49.00%		49.00%	100.00%
Business Acquisition, Cost of Acquired Entity, Purchase Price					$ 1,500,000
Business Acquisition, Contingent Consideration, at Fair Value							4,500,000
Payments to Acquire Businesses and Interest in Affiliates								2,400,000
Accrued Liabilities, Current	27,884,000	23,272,000							500,000	1,000,000
Sales Revenue, Goods, Gross			8,600,000	5,400,000
Sales Revenue, Services, Other			2,100,000	500,000
Deferred Revenue			200,000	600,000
Equity Method Investment, Deferred Gain on Sale			800,000	600,000
Business Combination, Acquired Receivables, Fair Value			800,000	600,000
Income (Loss) from Equity Method Investments	1,875,000	675,000	1,900,000	700,000
Proceeds from Equity Method Investment, Dividends or Distributions	316,000	241,000	300,000	200,000
Equity Method Investments	$ 6,133,000	$ 2,372,000	$ 6,100,000	$ 2,400,000