Note 7 - Supplemental Equity and Accumulated Other Comprehensive Income (Loss) (Details Textual) - USD ($) $ / shares in Units, $ in Thousands  | 
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Sep. 30, 2020  | 
Sep. 30, 2019  | 
Jun. 30, 2020  | 
|
| Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.32 | ||
| Interest Expense, Total | $ 4,416 | $ 5,222 | |
| Income Tax Expense (Benefit), Total | 5,944 | $ 3,408 | |
| AOCI Attributable to Parent [Member] | |||
| Deferred Income Tax Expense (Benefit), Total | $ (4,058) | ||
| AOCI Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | |||
| Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent | 2,100 | ||
| Interest Expense, Total | 2,769 | ||
| Income Tax Expense (Benefit), Total | 637 | ||
| Deferred Income Tax Expense (Benefit), Total | $ (3,413) | ||
| X | ||||||||||
- Definition Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| 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 
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Details 
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- Details 
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