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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2016
Notes Tables |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
|  | September 30, 2016 |  |  | September 30, 2015 |
|  | Aggregate fair value |  |  | Amortized/Adjusted cost basis |  |  | Pretax unrealized gains |  |  | Aggregate fair value |  |  | Amortized/Adjusted cost basis |  |  | Pretax unrealized gains |
Marketable securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stocks |  | $ | 158,462,000 |  |  | $ | 53,436,000 |  |  | $ | 105,026,000 |  |  | $ | 158,705,000 |  |  | $ | 49,604,000 |  |  | $ | 109,101,000 |
Bonds |  |  | 8,172,000 |  |  |  | 4,942,000 |  |  |  | 3,230,000 |  |  |  | 7,336,000 |  |  |  | 4,939,000 |  |  |  | 2,397,000 |
|  | $ | 166,634,000 |  |  | $ | 58,378,000 |  |  | $ | 108,256,000 |  |  | $ | 166,041,000 |  |  | $ | 54,543,000 |  |  | $ | 111,498,000 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
Intangible Assets |
|  | September 30, 2016 |  |  | September 30, 2015 |
|  | Customer Relationships |  |  | Developed Technology |  |  | Total |  |  | Customer Relationships |  |  | Developed Technology |  |  | Total |
Gross intangible |  | $ | 22,104,000 |  |  | $ | 2,525,000 |  |  | $ | 24,629,000 |  |  | $ | 22,104,000 |  |  | $ | 2,525,000 |  |  | $ | 24,629,000 |
Accumulated amortization |  |  | (14,938,000 | ) |  |  | (1,738,000 | ) |  |  | (16,676,000 | ) |  |  | (10,406,000 | ) |  |  | (1,233,000 | ) |  |  | (11,639,000 | )
|  | $ | 7,166,000 |  |  | $ | 787,000 |  |  | $ | 7,953,000 |  |  | $ | 11,698,000 |  |  | $ | 1,292,000 |  |  | $ | 12,990,000 |
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 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 250,000 |  |  | $ | 5,000 |  |  | $ | (55,000 | ) |  | $ | 200,000 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 250,000 |  |  | $ | 61,000 |  |  | $ | (61,000 | ) |  | $ | 250,000 |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 250,000 |  |  | $ | 41,000 |  |  | $ | (41,000 | ) |  | $ | 250,000 |

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