Note 7 - Lease Obligations - Future Minimum Lease Payments for Stores Under Construction (Details) - Asset under Construction, Capital Lease Finance Obligations [Member] $ in Thousands	Sep. 30, 2019 USD ($)
2020, Interest expense on capital lease finance obligations	$ 118
2020, Principle payments on capital lease finance obligations	18
2020, Interest expense on capital lease obligations for assets under construction	237
2020, Total future payments on capital lease obligations for assets under construction	123
2021, Interest expense on capital lease finance obligations	161
2021, Principle payments on capital lease finance obligations	26
2021, Interest expense on capital lease obligations for assets under construction	236
2021, Total future payments on capital lease obligations for assets under construction	132
2022, Interest expense on capital lease finance obligations	160
2022, Principle payments on capital lease finance obligations	28
2022, Interest expense on capital lease obligations for assets under construction	228
2022, Total future payments on capital lease obligations for assets under construction	139
2023, Interest expense on capital lease finance obligations	158
2023, Principle payments on capital lease finance obligations	30
2023, Interest expense on capital lease obligations for assets under construction	221
2023, Total future payments on capital lease obligations for assets under construction	147
2024, Interest expense on capital lease finance obligations	155
2024, Principle payments on capital lease finance obligations	33
2024, Interest expense on capital lease obligations for assets under construction	213
2024, Total future payments on capital lease obligations for assets under construction	155
Thereafter, Interest expense on capital lease finance obligations	1,368
Thereafter, Principle payments on capital lease finance obligations	756
Thereafter, Interest expense on capital lease obligations for assets under construction	1,827
Thereafter, Total future payments on capital lease obligations for assets under construction	3,944
Non-cash derecognition of capital lease finance obligations at end of lease term	1,459
Total future payments, interest expense on capital lease finance obligations	2,120
Total future payments, principle payments on capital lease finance obligations	2,350
Total future payments of capital lease obligations for assets under construction, Interest expense on capital lease obligations for assets under construction	2,962
Total future payments of capital lease obligations for assets under construction	$ 4,640