Note 10 - Lease Commitments (Details Textual) $ in Thousands		12 Months Ended
	Oct. 07, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Deferred Rent Credit, Noncurrent		$ 10,465	$ 8,809
Incentive from Lessor		9,160	8,379
Operating Leases, Income Statement, Sublease Revenue		300
Operating Leases, Rent Expense, Net		43,800	34,600	$ 26,300
Pre-Opening Costs and Relocation Expenses for Stores Not Yet Opened Rent Expense		1,400	1,400	800
Sale Leaseback Transaction, Lease Term	15 years
Sale Leaseback Transaction, Net Proceeds, Financing Activities	$ 2,600
Sale Leaseback Transaction, Deferred Loss, Gross	$ 500
Capital Lease Finance Obligations		26,900	25,600
Capital Lease Obligations		5,000	5,200
Build to Suit Lease in Process [Member]
Construction in Progress, Gross		$ 1,500	1,100
Chalet [Member]
Number of Properties Leased		5
Isely Family Land Trust LLC [Member]
Number of Properties Leased		1
FTVC, LLC [Member]
Number of Properties Leased		1
Related Parties [Member]
Operating Leases Future Minimum Payments Due Per Lease Agreement Low End of Range		$ 100
Operating Leases Future Minimum Payments Due Per Lease Agreement High End of Range		$ 300
Maximum [Member]
Operating Leases, Income Statement, Sublease Revenue			$ 100	$ 100