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Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Investments in Short-Term Time Deposits [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate used to estimate fair value	6.40%	6.30%
Long Term Notes Receivable From Municipalities [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate used to estimate fair value	2.70%	3.10%
Long-Term Debt [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest rate used to estimate fair value	3.80%	3.50%
Cash [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 63,723	$ 59,838
Investments in Reverse Repurchase Agreements [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	161	4,582
Investments in Term Deposits with Foreign Banks [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 7,750	19,174
Restricted Investments in Term Deposits with Foreign Banks [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		$ 3,635

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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- Definition

The amount of excess Tier 1 Risk Based Capital (which consists of the types of financial capital considered the most reliable and liquid, primarily Shareholders' equity. Examples of Tier 1 capital are common stock or unit, preferred stock or unit that is irredeemable and noncumulative, and retained earnings) divided by risk-weighted assets which are assets that are weighted for credit risk according to a formula used by the Reserve Bank.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

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- Definition

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+ References

No definition available.

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