Note 3 - Cash, Cash Equivalents, and Investments |
3 Months Ended | ||||||||||||||||||||||||||||||||||||
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Dec. 31, 2021 | |||||||||||||||||||||||||||||||||||||
| Notes to Financial Statements | |||||||||||||||||||||||||||||||||||||
| Cash and Cash Equivalents Disclosure [Text Block] |
Note 3. Cash, Cash Equivalents, and Investments
The Company invests its excess cash in bank certificates of deposit (“CDs”) that are fully insured by the Federal Deposit Insurance Corporation (“FDIC”) as well as U.S. Treasury securities and money market accounts. CDs and US Treasuries with original maturities of more than three months are reported as held-to-maturity investments and are recorded at amortized cost, which approximates fair value due to the negligible risk of changes in value due to interest rates. The maturity dates of the Company’s investments as of December 31, 2021 and September 30, 2021 are as follows:
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