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Note 11 - Employee Benefit Plans (Tables) | 3 Months Ended
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Dec. 31, 2021
Notes Tables |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Three Months Ended |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Components of net periodic pension cost: |  |  |  |  |  |  |  |
Service cost |  | $ | 162,072 |  |  | $ | 183,570 |
Interest cost |  |  | 253,279 |  |  |  | 243,785 |
Expected return on plan assets |  |  | (457,888 | ) |  |  | (503,936 | )
Recognized loss |  |  | 36,600 |  |  |  | 125,535 |
Net periodic pension cost |  | $ | (5,937 | ) |  | $ | 48,954 |
|  | Three Months Ended |
|  | December 31, |
|  | 2021 |  |  | 2020 |
Components of postretirement benefit cost: |  |  |  |  |  |  |  |
Service cost |  | $ | 24,450 |  |  | $ | 35,172 |
Interest cost |  |  | 110,930 |  |  |  | 107,623 |
Expected return on plan assets |  |  | (166,541 | ) |  |  | (149,122 | )
Recognized loss |  |  | — |  |  |  | 38,664 |
Net postretirement benefit cost |  | $ | (31,161 | ) |  | $ | 32,337 |
Summary of Employer Contributions to Defined Benefit Plans [Table Text Block] |
|  | Fiscal Year-to-Date Contributions |  |  | Remaining Fiscal Year Contributions |
Pension plan |  | $ | — |  |  | $ | 500,000 |
Postretirement plan |  |  | — |  |  |  | 400,000 |
Total |  | $ | — |  |  | $ | 900,000 |

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- Definition Tabular disclosure of the summary of employer contributions to defined benefit plans. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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