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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2018 |  |  | September 30, 2017 |
|  | Aggregate fair value |  |  | Amortized/ Adjusted cost basis |  |  | Pretax unrealized gains |  |  | Aggregate fair value |  |  | Amortized/ Adjusted cost basis |  |  | Pretax unrealized gains |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stocks |  | $ | 212,296,000 |  |  | $ | 53,889,000 |  |  | $ | 158,407,000 |  |  | $ | 220,973,000 |  |  | $ | 58,449,000 |  |  | $ | 162,524,000 |
Bonds |  |  | --- |  |  |  | --- |  |  |  | --- |  |  |  | 8,292,000 |  |  |  | 4,944,000 |  |  |  | 3,348,000 |
|  | $ | 212,296,000 |  |  | $ | 53,889,000 |  |  | $ | 158,407,000 |  |  | $ | 229,265,000 |  |  | $ | 63,393,000 |  |  | $ | 165,872,000 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
|  | September 30, 2018 |  |  | September 30, 2017 |
|  | Customer Relationships |  |  | Developed Technology |  |  | Total |  |  | Customer Relationships |  |  | Developed Technology |  |  | Total |
Gross intangible |  | $ | 21,950,000 |  |  | $ | 2,525,000 |  |  | $ | 24,475,000 |  |  | $ | 21,950,000 |  |  | $ | 2,525,000 |  |  | $ | 24,475,000 |
Accumulated amortization |  |  | (21,950,000 | ) |  |  | (2,525,000 | ) |  |  | (24,475,000 | ) |  |  | (19,174,000 | ) |  |  | (2,243,000 | ) |  |  | (21,417,000 | )
|  | $ | --- |  |  | $ | --- |  |  | $ | --- |  |  | $ | 2,776,000 |  |  | $ | 282,000 |  |  | $ | 3,058,000 |
Valuation and Qualifying Accounts [Table Text Block] |
Description |  | Balance at Beginning of Year |  |  | Additions Charged to Costs and Expenses |  |  | Accounts Charged off less Recoveries |  |  | Balance at End of Year |
Fiscal 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 200,000 |  |  | $ | 6,000 |  |  | $ | (6,000 | ) |  | $ | 200,000 |
Fiscal 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 200,000 |  |  | $ | 33,000 |  |  | $ | (33,000 | ) |  | $ | 200,000 |
Fiscal 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 250,000 |  |  | $ | 5,000 |  |  | $ | (55,000 | ) |  | $ | 200,000 |

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