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Note 10 - Convertible Preferred Stock and Stockholder's Equity (Details Textual) |  |  |  | 1 Months Ended | 10 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 22, 2018 shares | Mar. 31, 2017 $ / shares $ / item shares | Jan. 07, 2016 USD ($) shares | Jan. 31, 2018 shares | Mar. 31, 2017 USD ($) $ / shares $ / item shares | Jan. 07, 2018 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) shares | Mar. 14, 2017 $ / item
Proceeds from Issuance of Convertible Preferred Stock, Net of Offering Costs | $ |  |  |  |  |  |  | $ 22,129,774 |  |
Warrant Expense | $ |  |  |  |  |  |  | 10,225,846 |  |
Dividends | $ |  |  |  |  |  |  | 1,252,394 |  |
Stock Reclassified Upon Conversion of Preferred Stock | $ |  |  |  |  |  |  | $ 190,080 |  |
Make-Whole Provision Conversion Price, Percentage |  |  |  |  |  |  | 105.00% |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  | 478,200 |  |  |  |  |  |
Stock Issued During Period, Shares, Total |  |  |  |  |  |  |  | 2,226,698 |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  |  |  |  | 1,861,503 |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  |  | 17,606 | 45,643 |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  |  |  |  |  |  |  | 217,122 |
Fair Value Adjustment of Warrants | $ |  |  |  |  |  |  | $ (22,072,322) |  |
General Financial Advisory Services [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  |  |  | 102,430 |
Diffusion LLC [Member] |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Divestiture, Amount of Consideration Received | $ |  |  | $ 400,000 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price |  |  |  |  |  |  | 2.02 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Financing Trigger from Issuance of Common Stock | $ |  |  |  |  |  |  | $ 10,000,000 |  |
Convertible Preferred Stock, Make-Whole Provision, Proceeds from Issue of Common Stock | $ |  |  |  |  |  |  | 10,000,000 |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Make-whole Adjustment |  |  |  | 11,668,421 |  |  |  |  |
Conversion From Series A Preferred Stock to Common Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | 20,568,632 |  |  |  |  |  |  |  |
Conversion From Series A Preferred Stock to Common Stock Automated Conversion [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | 8,306,278 |  |  |  |  |  |  |  |
Conversion From Series A Preferred Stock to Common Stock, Settlement of Accrued Dividends [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | 593,933 |  |  |  |  |  |  |  |
Conversion From Series A Preferred Stock to Common Stock, Make-Whole Adjustment [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | 11,668,421 |  |  |  |  |  |  |  |
Warrant [Member] |  |  |  |  |  |  |  |  |
Warrant Expense | $ |  |  |  |  |  |  | $ 10,200,000 |  |
Class of Warrant or Rights, Expired |  |  |  |  |  |  | 13,000 | 17,479 |
Private Placement [Member] |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Votes Per Share | $ / item |  | 0.50627 |  |  | 0.50627 |  |  |  | 0.84874
Private Placement [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  | 1 |  |  | 1 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 2.22 |  |  | $ 2.22 |  |  |  |
Class of Warrant or Right, Term |  | 5 years |  |  |  |  |  |  |
Warrant Expense | $ |  |  |  |  |  |  | $ 10,200,000 |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  | 13,750,000 |  |
Proceeds from Issuance of Private Placement | $ |  |  |  |  |  |  | $ 0 |  |
Dividends | $ |  |  |  |  |  |  | $ 1,252,394 |  |
Stock Reclassified Upon Conversion of Preferred Stock, Shares |  |  |  |  |  |  | 86,335 |  |
Stock Reclassified Upon Conversion of Preferred Stock | $ |  |  |  |  |  |  | $ 1,100,000 |  |
Conversion of Stock, Shares Converted |  |  |  |  |  |  | 4,070,051 |  |
Fair Value Adjustment of Warrants | $ |  |  |  |  |  |  | $ 22,100,000 |  |
Series A Preferred Stock [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Make-Whole Provision, Minimum Share Price | $ / shares |  |  |  |  |  |  | $ 8 |  |
Series A Preferred Stock [Member] | Conversion From Series A Preferred Stock to Common Stock [Member] |  |  |  |  |  |  |  |  |
Dividends | $ |  |  |  |  |  |  | $ 200,000 |  |
Series A Preferred Stock [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Private Placement | $ |  |  |  |  | $ 25,000,000 |  |  |  |
Number of Convertible Preferred Stock Per Unit |  | 1 |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  | 8.00% |  |  |  |  |  |  |
Number of Common Stock Per Unit |  | 1 |  |  |  |  |  |  |
Convertible Preferred Stock, Conversion Price |  | 2.02 |  |  | 2.02 |  |  |  |
Temporary Equity, Stock Issued During Period, New Issues |  |  |  |  | 12,376,329 |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock, Net of Offering Costs | $ |  |  |  |  | $ 22,100,000 |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  | $ 2,900,000 |  |  |
Dividends | $ |  |  |  |  |  |  | $ 1,300,000 |  |
Series B Preferred Stock [Member] | Private Placement [Member] | Placement Agent [Member] |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 2.22 |  |  | $ 2.22 |  |  |  |
Class of Warrant or Right, Term |  | 5 years |  |  |  |  |  |  |
Class of Warrant or Right, Granted During Period |  |  |  |  | 1,179,558 |  |  |  |
Series A Convertible Preferred Stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 8.00% |  |  |  |  |  |  |  |

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