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Note 13 - Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 233,333 | 1,250 |
Proceeds from Stock Options Exercised | $ 373,228 | $ 2,200 |
Incresase in Accounts Receivable, Stock Options Exercised | $ 240,228 |  |
Preferred Stock, Shares Authorized | 5,000,000 | 5,000,000 |
Preferred Stock, Par or Stated Value Per Share | $ 0.00001 | $ 0.00001 |
Preferred Stock, Shares Outstanding | 0 | 0 |
Share Buyback Program [Member] |  |  |
Stock Repurchase Program, Authorized Amount |  |  | $ 4,000,000
Stock Repurchased and Retired During Period, Shares | 0 | 1,099,608 |
Stock Repurchased During Period, Value |  | $ 1,748,456 |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period | 125,000 | 0 |

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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