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Note 5 - Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2020
Notes Tables |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | September 30, 2020 |
|  | Cost Basis |  |  | Unrealized Gain |  |  | Fair Value |  |  | Cash Equivalents |  |  | Short-term Securities |  |  | Long-term Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 365 |  |  | $ | - |  |  | $ | 365 |  |  | $ | 365 |  |  | $ | - |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 1,195 |  |  |  | - |  |  |  | 1,195 |  |  |  | - |  |  |  | - |  |  |  | 1,195 |
Municipal securities |  |  | 3,777 |  |  |  | 4 |  |  |  | 3,781 |  |  |  | - |  |  |  | 2,432 |  |  |  | 1,350 |
Corporate bonds |  |  | 3,091 |  |  |  | 3 |  |  |  | 3,094 |  |  |  | - |  |  |  | 1,833 |  |  |  | 1,260 |
Subtotal |  |  | 8,063 |  |  |  | 7 |  |  |  | 8,070 |  |  |  | - |  |  |  | 4,265 |  |  |  | 3,805 |
Total |  | $ | 8,428 |  |  | $ | 7 |  |  | $ | 8,435 |  |  | $ | 365 |  |  | $ | 4,265 |  |  | $ | 3,805 |
|  | September 30, 2019 |
|  | Cost Basis |  |  | Unrealized Gain |  |  | Fair Value |  |  | Cash Equivalents |  |  | Short-term Securities |  |  | Long-term Securities |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 276 |  |  | $ | - |  |  | $ | 276 |  |  | $ | 276 |  |  | $ | - |  |  | $ | - |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 972 |  |  |  | - |  |  |  | 972 |  |  |  | - |  |  |  | 499 |  |  |  | 473 |
Municipal securities |  |  | 240 |  |  |  | - |  |  |  | 240 |  |  |  | - |  |  |  | 80 |  |  |  | 160 |
Corporate bonds |  |  | 3,857 |  |  |  | 11 |  |  |  | 3,868 |  |  |  | - |  |  |  | 3,116 |  |  |  | 752 |
Subtotal |  |  | 5,069 |  |  |  | 11 |  |  |  | 5,080 |  |  |  | - |  |  |  | 3,695 |  |  |  | 1,385 |
Total |  | $ | 5,345 |  |  | $ | 11 |  |  | $ | 5,356 |  |  | $ | 276 |  |  | $ | 3,695 |  |  | $ | 1,385 |
Schedule of Derivative Instruments [Table Text Block] |
Derivatives not designated as hedging instruments |  | Asset position |  |  | Unrealized loss |  |  | Liability Position |
Foreign currency forward contract |  | $ | 5,205 |  |  | $ | (76 | ) |  | $ | 5,281 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121590274&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579240-113959 + Details
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