Quarterly report pursuant to Section 13 or 15(d)

Note 9 - Income Taxes (Details Textual)

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Note 9 - Income Taxes (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Income Tax Expense (Benefit), Total $ 99,000 $ (101,000) $ 395,000 $ (304,000)  
Effective Income Tax Rate Reconciliation, Percent, Total 21.20% (24.90%) 22.30% (91.10%)  
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability       $ (384,000)  
Unrecognized Tax Benefits, Ending Balance $ 0   $ 0    
State and Local Jurisdiction [Member]          
Operating Loss Carryforwards, Valuation Allowance, Total $ 105,000   $ 105,000   $ 105,000
State and Local Jurisdiction [Member] | Deferred Tax Assets Related to Operating Loss Carryforwards [Member]          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       $ 32,000