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Marketable Securities (Tables) | 6 Months Ended
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Mar. 31, 2019
Marketable Securities [Abstract] |
Debt Securities, Available-for-sale [Table Text Block] | At March 31, 2019 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | $ | 2,503 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 2,497 |
Total marketable securities | $ | 2,503 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 2,497 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $3.
At September 30, 2018 our marketable securities were (in thousands):
| Amortized Cost (1) |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value (1)
Current marketable securities: |  |  |  |  |  |  |
Certificates of deposit | $ | 4,756 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 4,736 |
Total marketable securities | $ | 4,756 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 4,736 |
(1) | Included in amortized cost and fair value is purchased and accrued interest of $6.
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] | The following tables show the fair values and gross unrealized losses of our available-for-sale marketable securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):
| March 31, 2019
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Certificates of deposit | $ | — |  |  | $ | — |  |  | $ | 2,497 |  |  | $ | (6 | )
Total | $ | — |  |  | $ | — |  |  | $ | 2,497 |  |  | $ | (6 | )
| September 30, 2018
| Less than 12 Months |  | More than 12 Months
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Certificates of deposit | $ | — |  |  | $ | — |  |  | $ | 4,736 |  |  | $ | (20 | )
Total | $ | — |  |  | $ | — |  |  | $ | 4,736 |  |  | $ | (20 | )

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of fair value amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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