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Note 3 - Recent Accounting Pronouncements (Details Textual) - USD ($) | Oct. 01, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2018
--- | --- | --- | --- | ---
Deferred Tax Assets, Valuation Allowance, Total |  | $ 15,012,000 | $ 15,017,000 |
Accounting Standards Update 2016-09 [Member] |  |  |  |
Deferred Tax Assets, Valuation Allowance, Total |  |  |  | $ 1,100,000
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |
Operating Lease, Liability, Total | $ 7,800,000 |  |  |
Operating Lease, Right-of-Use Asset | 5,800,000 |  |  |
Cumulative Effect on Retained Earnings, Net of Tax, Total | $ 0 |  |  |

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