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