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Note 9 - Stockholders' Equity (Details Textual) |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |
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May 30, 2018 USD ($) $ / shares shares | Dec. 20, 2017 USD ($) $ / shares shares | Oct. 26, 2017 USD ($) $ / shares shares | Jun. 29, 2017 $ / shares shares | Apr. 03, 2017 USD ($) $ / shares $ / item shares | Jun. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | May 29, 2018 $ / shares shares | May 09, 2018 $ / item shares | Sep. 30, 2017 shares | Dec. 31, 2016 $ / shares shares | May 19, 2014 $ / shares shares
Number of Shares Authorized to Issue |  |  |  |  |  |  |  | 185,000,000 |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  | 175,000,000 | 175,000,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.18 | $ 0.18 |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  |  |
Stockholder Rights Agreement, Number of Preferred Stock Right Distributed for Each Share of Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 1
Stockholder Rights Agreement, Acquiring Person, Percentage of Ownership |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00%
Stockholder Rights Agreement, Acquiring Person, Additional Percentage of Ownership |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Stockholder Rights Agreement, Initial Exercise Price of Each Right | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15
Stockholder Rights Agreement, Share Price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30
Stock Issued During Period, Shares, New Issues |  |  |  | 125,000 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  |  | $ 0 |  |  |  | $ 0 |
Preferred Stock, Deemed Dividend | $ |  |  |  |  |  | $ 11,479,308 | $ 11,479,308 | $ 11,479,308 | $ 2,568,132 |  |  |  |  |
Lock-up Period Extension |  |  |  | 45 days |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  | 3,875,699 | 0 |  |  |  | 0 |
Proceeds from Issuance of Stock units | $ |  |  |  |  |  |  |  |  | $ 3,871,636 |  |  |  |  |
Consummate a Business Combination, Percentage of Acquired Outstanding Shares |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Consummate a Business Combination, Percentage of Aggregate Ordinary Voting Power |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |
Conversion of Series A Convertible Preferred Stock into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  |  |  |  |  | 292 |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  |  |  |  |  |  |  |  | 389,111 |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  |  |  |  |  |  |  | 111 |  |  |  |  |
Conversion of Series B Convertible Preferred Stock into Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  |  |  |  | 11,245 |  |  |  |  |  |
Convertible Preferred Stock, Shares Issued upon Conversion |  |  |  |  |  |  |  | 284 |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  |  |  |  |  | 3,194,600 |  |  |  |  |  |
The 2017 Public Offering Class B Units Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  | $ 3.12 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right Cancelled |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  |  | 0 |  |  | 0 |  |
The 2017 Public Offering Class B Units Warrants [Member] | Weighted Average [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Price | $ / shares |  |  |  | $ 6.24 |  |  |  |  |  |  |  |  |  |
The 2018 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  |  |  |  | $ 4.048 |  |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Class of Warrant or Right, Outstanding |  |  |  |  |  |  |  | 3,869,216 |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Warrants Exercisable, Ownership Percentage of Company’s Shares Allowed |  |  |  |  |  |  |  | 4.99% |  |  |  |  |  |
Common Stock, Convertible, Ownership Percentage of Company’s Shares Allowed |  |  |  |  |  |  |  | 9.99% |  |  |  |  |  |
Warrants and Rights Outstanding, Redemption Price | $ / shares |  |  |  |  |  |  |  | $ 0.18 |  |  |  |  |  |
Warrants and Rights Outstanding, Redeemable, Volume-weighted-average-price of Our Common Stock | $ / shares |  |  |  |  |  |  |  | $ 10.56 |  |  |  |  |  |
Warrants and Rights, Redemption Rights, Consecutive Trading Days |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
The 2017 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total | $ |  |  |  |  | $ 4,400,000 |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Net | $ |  |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 55,333 |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Beneficial Conversion Feature on Preferred Stock | $ |  |  |  |  | $ 1,284,066 |  |  |  |  |  |  |  |  |
The 2017 Public Offering [Member] | The 2017 Public Offering Class A Units Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 55,333 |  |  |  |  |  |  |  |  |
The 2017 Public Offering [Member] | The 2017 Public Offering Class B Units Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 389,111 |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 83,333 |  | 44,167 |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  | $ 5.28 |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | The 2017 Public Offering Over-allotment Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 44,167 |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  |  |  |  | $ 11.25 |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
October 2017 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Net | $ |  |  | $ 4,900,000 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 958,333 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  |  | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  |  | $ 5.28 |  |  |  |  |  |  |  |  |  |  |
December 2017 Public Offering and Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Net | $ |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 441,667 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share | $ / shares |  | $ 3.24 |  |  |  |  |  |  |  |  |  |  |  |
December 2017 Public Offering and Private Placement [Member] | Class A and Class B Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 883,333 |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares |  | $ 3.78 |  |  |  |  |  |  |  |  |  |  |  |
Warrants and Rights Outstanding, Term |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercisable Period |  | 180 days |  |  |  |  |  |  |  |  |  |  |  |
The 2018 Subscription Rights Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units Sold | 13,624 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase Price of Unit | $ / item |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |
Adjustments to Additional Paid in Capital, Beneficial Conversion Feature on Preferred Stock | $ |  |  |  |  |  |  |  | $ 4,782,100 |  |  |  |  |  |
Preferred Stock, Deemed Dividend | $ |  |  |  |  |  |  |  | 11,479,308 |  |  |  |  |  |
Number of Units Authorized to Purchase, Maximum |  |  |  |  |  |  |  |  |  |  | 25,000 |  |  |
Number of Series B Convertible Preferred Stock and Warrant in Each Unit |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right |  |  |  |  |  |  |  |  |  |  | 284 |  |  |
Proceeds from Issuance of Stock units | $ | $ 12,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs | $ |  |  |  |  |  |  |  | 1,333,449 |  |  |  |  |  |
The 2018 Subscription Rights Offering [Member] | The 2018 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares | $ 4.048 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Outstanding | 3,869,216 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants Allocated to Common Stock , Net of Issuance Cost | $ |  |  |  |  |  |  |  | $ 5,363,759 |  |  |  |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  | 750,000 |  |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.001 |  |  |  |  |  |
Preferred Stock, Shares Issued, Total |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Series A Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  | 4,000 | 4,000 |  |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  |  |
Preferred Stock, Shares Issued, Total |  |  |  |  |  |  |  | 0 |  |  |  |  |  |
Preferred Stock, Deemed Dividend | $ |  |  |  |  | $ 2,568,132 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Series A Convertible Preferred Stock [Member] | The 2017 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  | 292 |  |  |  |  |  |  |  |  |
Convertible Preferred Stock, Shares Issuable |  |  |  |  | 389,111 |  |  |  |  |  |  |  |  |
Series B Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized |  |  |  |  |  |  |  | 25,000 | 0 | 25,000 |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |
Preferred Stock, Shares Issued, Total |  |  |  |  |  |  |  | 2,379 | 0 |  |  |  |  |
Preferred Stock, Shares Outstanding, Ending Balance |  |  |  |  |  |  |  | 2,379 | 0 |  |  |  |  |
Stated Value per Share | $ / shares |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |
Preferred Stock, Convertible, Conversion Price | $ / shares |  |  |  |  |  |  |  | $ 3.52 |  |  |  |  |  |
Preferred Stock, Convertible, Ownership Percentage of Company’s Shares Allowed |  |  |  |  |  |  |  | 9.99% |  |  |  |  |  |
Series B Convertible Preferred Stock [Member] | The 2018 Subscription Rights Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues | 13,624 |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Units [Member] | The 2017 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units Sold |  |  |  |  | 55,333 |  |  |  |  |  |  |  |  |
Purchase Price of Unit | $ / item |  |  |  |  | 9 |  |  |  |  |  |  |  |  |
Class B Units [Member] | The 2017 Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Units Sold |  |  |  |  | 292 |  |  |  |  |  |  |  |  |
Purchase Price of Unit | $ / item |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |

X
- Definition Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of convertible preferred stock with a beneficial conversion feature. + References No definition available. + Details
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- Definition Number of warrants cancelled during period. + References No definition available. + Details
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Balance Type: | na
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- Definition Period after which warrants become exercisable. + References No definition available. + Details
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- Definition Percentage of ownership of common stock allowed. + References No definition available. + Details
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- Definition Represents the percentage of acquired outstanding shares when company consummates a business. + References No definition available. + Details
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- Definition Represents the percentage of aggregate ordinary voting power of third party when company consummates a business combination. + References No definition available. + Details
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- Definition Number of shares issued for convertible preferred stock. + References No definition available. + Details
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- Definition Change in "Lock-up period" under the agreement. + References No definition available. + Details
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- Definition Represents number of series B convertible preferred stock and warrant in each unit. + References No definition available. + Details
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- Definition Represents total number of shares authorized to issue. + References No definition available. + Details
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- Definition Represents maximum number of units authorized to purchase. + References No definition available. + Details
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- Definition Represents number of units sold. + References No definition available. + Details
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- Definition Represents the conversion price of convertible preferred stock. + References No definition available. + Details
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- Definition Represents the maximum ownership percentage of company’s shares allowed for holder of convertible preferred stock to be able to convert their shares. + References No definition available. + Details
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- Definition The amount of deemed dividend on preferred stock. + References No definition available. + Details
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- Definition The cash inflow from issuance of stock units. + References No definition available. + Details
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- Definition he cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity, net of issuance costs. + References No definition available. + Details
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- Definition Represents the purchase price of each unit. + References No definition available. + Details
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- Definition Represents the stated value per share. + References No definition available. + Details
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- Definition Represents the additional ownership percentage of company’s common stock required to if that person already own 15% or more of company’s common stock on date of stockholder rights agreement. + References No definition available. + Details
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- Definition Represents the ownership percentage of company’s common stock required to become “Acquiring Person” under stockholder rights agreement. + References No definition available. + Details
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- Definition Represents the initial exercise price of each right under stockholder rights agreement. + References No definition available. + Details
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- Definition Represents number of preferred stock right distributed for each share of common stock under stockholder rights agreement. + References No definition available. + Details
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- Definition Represents the amount of share price that each holder of right can receive by exercising the right. + References No definition available. + Details
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- Definition Represents the fair value of warrants allocated to common stock at the date of issuance. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the minimum volume-weighted-average-price of our common stock required to redeem warrants and rights outstanding. + References No definition available. + Details
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- Definition Represents the redemption price of each warrants and rights outstanding. + References No definition available. + Details
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Data Type: | num:perShareItemType
Balance Type: | na
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- Definition Threshold period of specified consecutive trading days within which common stock price equals or exceed certain amount. + References No definition available. + Details
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- Definition Represents the maximum ownership percentage of company’s shares allowed for holder of warrants to exercise their warrants. + References No definition available. + Details
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