Note 15 - Litigation (Details) (Knight Transportation, Inc. [Member], USD $)	1 Months Ended	3 Months Ended
	Sep. 26, 2013	Dec. 31, 2013	Aug. 28, 2013
Knight Transportation, Inc. [Member]
Note 15 - Litigation (Details) [Line Items]
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