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Note 11 - Commitments and Contingencies (Details Textual) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2016 shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Nov. 29, 2011 ft²
Area of Leased Facility | ft² |  |  |  | 31,360
Operating Leases, Average Monthly Payments Due, Current |  | $ 16,306 |  |
Operating Leases, Average Monthly Payments, Due in Second Year |  | 25,088 |  |
Operating Leases, Average Monthly Payments, Due in Third Year |  | 26,656 |  |
Operating Leases, Average Monthly Payments, Due in Fourth Year |  | 28,224 |  |
Operating Leases, Average Monthly Payments, Due in Fifth Year |  | 29,792 |  |
Operating Leases, Average Monthly Payments, Due in Sixth Year |  | 31,360 |  |
Operating Leases, Rent Expense, Net |  | 351,418 | $ 377,033 |
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | 196,239 | 157,081 |
Bonuses and Related Payroll Tax Expense [Member] |  |  |  |
Increase (Decrease) in Other Employee-Related Liabilities |  | $ 1,100,693 | $ 0 |
Performance Shares [Member] | Chief Executive Officer [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vesting Upon Employee Termination and Change of Control, Number of Shares | shares | 375,000 |  |  |

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