Note 9 - Income Taxes (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2020 |
Mar. 31, 2019 |
Sep. 30, 2019 |
|
| Income Tax Expense (Benefit), Total | $ 190,000 | $ 99,000 | $ 313,000 | $ 395,000 | |
| Effective Income Tax Rate Reconciliation, Percent, Total | 20.30% | 21.20% | 20.00% | 22.30% | |
| Unrecognized Tax Benefits, Ending Balance | $ 0 | $ 0 | |||
| State and Local Jurisdiction [Member] | |||||
| Operating Loss Carryforwards, Valuation Allowance, Total | $ 47,000 | $ 47,000 | $ 47,000 | ||
| X | ||||||||||
- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|