Note 16 - Litigation (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended
	Dec. 31, 2011	Sep. 26, 2013 Knight Transportation, Inc. [Member]	Dec. 31, 2013 Knight Transportation, Inc. [Member]	Aug. 28, 2013 Knight Transportation, Inc. [Member]
Note 16 - Litigation (Details) [Line Items]
Litigation Settlement, Amount	$ 0.2
Shares Acquired for the Purpose of Merger		829,946	1,287,782
Percentage of Shares Owned by Other Party		7.90%	12.20%
Merger Offer Per Share				$ 9.00