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Note A - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Sep. 30, 2014
Note A - Summary of Significant Accounting Policies (Tables) [Line Items] |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | September 30, 2014 |  |  | September 30, 2013 |
Less than one year |  | $ | 6,632,000 |  |  | $ | 5,992,000 |
1-3 years |  |  | 8,302,000 |  |  |  | 6,770,000 |
Total |  | $ | 14,934,000 |  |  | $ | 12,762,000 |
Schedule of Inventory, Current [Table Text Block] |
|  | September 30, 2014 |  |  | September 30, 2013 |
Raw materials |  | $ | 3,729,160 |  |  | $ | 4,110,224 |
Work-in-process |  |  | 292,557 |  |  |  | 494,980 |
Finished goods |  |  | 1,368,625 |  |  |  | 1,021,560 |
|  | $ | 5,390,342 |  |  | $ | 5,626,764 |
Property, Plant and Equipment [Table Text Block] |
|  | September 30, 2014 |  |  | September 30, 2013 |
Manufacturing Equipment |  | $ | 3,057,665 |  |  | $ | 2,404,797 |
Office Equipment |  |  | 1,985,409 |  |  |  | 1,862,847 |
Leasehold Improvements |  |  | 320,218 |  |  |  | 127,883 |
Vehicles |  |  | 192,321 |  |  |  | 154,945 |
|  |  | 5,555,613 |  |  |  | 4,550,472 |
Less accumulated depreciation |  |  | 3,093,363 |  |  |  | 2,753,660 |
|  | $ | 2,462,250 |  |  | $ | 1,796,812 |
Depreciation expense |  | $ | 699,306 |  |  | $ | 475,524 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
Year ended September 30, |  | 2014 |  |  | 2013 |  |  | 2012 |
Net income |  | $ | 5,432,851 |  |  | $ | 4,733,844 |  |  | $ | 7,701,194 |
Weighted average common shares |  |  | 12,916,273 |  |  |  | 12,527,153 |  |  |  | 12,371,371 |
Dilutive potential common shares |  |  | 685,321 |  |  |  | 551,786 |  |  |  | 418,797 |
Weighted average dilutive common shares outstanding |  |  | 13,601,594 |  |  |  | 13,078,939 |  |  |  | 12,790,168 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.42 |  |  | $ | 0.38 |  |  | $ | 0.62 |
Diluted |  | $ | 0.40 |  |  | $ | 0.36 |  |  | $ | 0.60 |
Useful Lives [Member] |
Note A - Summary of Significant Accounting Policies (Tables) [Line Items] |
Property, Plant and Equipment [Table Text Block] |
| Years |
Equipment | 3 | - | 7 |
Leasehold improvements | 7 | - | 10 | or life of lease
Vehicles |  | 3 |  |

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