Note 3 - Income Taxes (Details) - Summary of Differences Between U.S. Federal Statutory Rate and Company's Effective Tax Rate	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Summary of Differences Between U.S. Federal Statutory Rate and Company's Effective Tax Rate [Abstract]
Statutory tax rate	34.00%	34.00%	34.00%
State income taxes, net of U.S. federal tax benefit	5.40%	3.50%	4.60%
Charges without tax benefit	1.20%	1.40%	0.70%
Tax credits and other exclusions	(2.30%)	(0.90%)	0.70%
Company’s effective tax rate	38.30%	38.00%	40.00%