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Note 12 - Share-based Compensation (Tables) | 12 Months Ended
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Sep. 30, 2017
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2017 |  |  | 2016 |
Volatility |  |  | 42.6% | - | 53.7% |  |  |  | 49.0% | - | 52.0% |
Risk-free interest rate |  |  | 1.73% | - | 2.01% |  |  |  | 1.0% | - | 1.7% |
Forfeiture rate |  |  |  | 10.0% |  |  |  |  |  | 10.0% |  |
Dividend yield |  |  |  | 0.0% |  |  |  |  | 2.2% | - | 2.7% |
Expected life in years |  |  | 3.8 | - | 4.6 |  |  |  | 3.2 | - | 4.6 |
Weighted average fair value of options granted during the period |  |  |  | $0.71 |  |  |  |  |  | $0.70 |  |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  | Number |
|  | of Shares |
Balance, September 30, 2016 |  |  | - |
Granted |  |  | 250,000 |
Released |  |  | (125,000 | )
Forfeited/cancelled |  |  | - |
Balance, September 30, 2017 |  |  | 125,000 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number |  |  | Weighted Average |
|  | of Shares |  |  | Exercise Price |
Outstanding October 1, 2016 |  |  | 4,404,002 |  |  | $ | 2.18 |
Granted |  |  | 574,500 |  |  | $ | 2.09 |
Forfeited/expired |  |  | (81,667 | ) |  | $ | 2.51 |
Exercised |  |  | (233,333 | ) |  | $ | 1.60 |
Outstanding September 30, 2017 |  |  | 4,663,502 |  |  | $ | 2.16 |
Exercisable September 30, 2017 |  |  | 3,329,437 |  |  | $ | 2.25 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  |  |  |  |  | Weighted |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  |  | Average |  |  | Weighted |  |  |  |  |  |  | Weighted |
Range of |  |  |  |  |  | Remaining |  |  | Average |  |  |  |  |  |  | Average |
Exercise |  | Number |  |  | Contractual |  |  | Exercise |  |  | Number |  |  | Exercise |
Prices |  | Outstanding |  |  | Life |  |  | Price |  |  | Exercisable |  |  | Price |
$0.93 | - | $1.76 |  |  | 1,332,752 |  |  |  | 4.35 |  |  | $ | 1.65 |  |  |  | 1,036,036 |  |  | $ | 1.63 |
$1.77 | - | $1.99 |  |  | 1,654,500 |  |  |  | 4.63 |  |  | $ | 1.93 |  |  |  | 626,526 |  |  | $ | 1.89 |
$2.00 | - | $2.85 |  |  | 905,000 |  |  |  | 2.31 |  |  | $ | 2.57 |  |  |  | 902,500 |  |  | $ | 2.57 |
$2.86 | - | $3.13 |  |  | 761,250 |  |  |  | 1.29 |  |  | $ | 3.00 |  |  |  | 757,500 |  |  | $ | 3.00 |
$3.14 | - | $3.17 |  |  | 10,000 |  |  |  | 4.14 |  |  | $ | 3.17 |  |  |  | 6,875 |  |  | $ | 3.17 |
$0.93 | - | $3.17 |  |  | 4,663,502 |  |  |  | 3.41 |  |  | $ | 2.18 |  |  |  | 3,329,437 |  |  | $ | 2.25 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] |
Years Ended September 30, |  | 2017 |  |  | 2016 |
Cost of revenues |  | $ | 24,151 |  |  | $ | 24,092 |
Selling, general and administrative |  |  | 998,540 |  |  |  | 478,695 |
Research and development |  |  | 93,709 |  |  |  | 102,639 |
Total |  | $ | 1,116,400 |  |  | $ | 605,426 |

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