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Note 14 - Share-based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2018
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2018 |  |  | 2017 |
Volatility |  |  | 45.4% |  |  | 42.6% | - | 53.7% |
Risk free interest rate |  |  | 2.18% |  |  | 1.73% | - | 2.01% |
Forfeiture rate |  |  | 10.0% |  |  |  | 10.0% |  |
Dividend yield |  |  | 0.0% |  |  |  | 0.0% |  |
Expected life in years |  |  | 4.6 |  |  | 3.8 | - | 4.6 |
Weighted average FV |  |  | $0.89 |  |  |  | $0.71 |  |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number of Shares |
Outstanding October 1, 2017 |  |  | 125,000 |
Granted |  |  | 218,330 |
Released |  |  | (125,000 | )
Forfeited/cancelled |  |  | - |
Outstanding September 30, 2018 |  |  | 218,330 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |
Outstanding October 1, 2017 |  |  | 4,663,502 |  |  | $ | 2.18 |
Granted |  |  | 3,500 |  |  | $ | 2.21 |
Forfeited/expired |  |  | (92,688 | ) |  | $ | 2.74 |
Exercised |  |  | (1,179,456 | ) |  | $ | 2.06 |
Outstanding September 30, 2018 |  |  | 3,394,858 |  |  | $ | 2.21 |
Exerciseable September 30, 2018 |  |  | 2,384,576 |  |  | $ | 2.27 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
Range of Exercise Prices |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
$0.93 | - | $1.76 |  |  | 912,966 |  |  |  | 5.28 |  |  |  | 1.63 |  |  |  | 783,059 |  |  |  | 1.62 |
$1.77 | - | $1.99 |  |  | 1,346,642 |  |  |  | 5.15 |  |  |  | 1.97 |  |  |  | 471,642 |  |  |  | 1.93 |
$2.00 | - | $2.85 |  |  | 364,000 |  |  |  | 3.08 |  |  |  | 2.55 |  |  |  | 360,500 |  |  |  | 2.55 |
$2.86 | - | $3.17 |  |  | 771,250 |  |  |  | 0.33 |  |  |  | 3.00 |  |  |  | 769,375 |  |  |  | 3.00 |
$0.93 | - | $3.17 |  |  | 3,394,858 |  |  |  |  |  |  |  |  |  |  |  | 2,384,576 |  |  |  |  |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
Year ended September 30, |  | 2018 |  |  | 2017 |
Cost of revenues |  | $ | 21,388 |  |  | $ | 24,151 |
Selling, general and administrative |  |  | 479,165 |  |  |  | 998,540 |
Research and development |  |  | 84,320 |  |  |  | 93,709 |
|  | $ | 584,873 |  |  | $ | 1,116,400 |

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