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Note 13 - Subsequent Events (Details Textual) - USD ($) | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Feb. 28, 2019 | Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 17, 2019 | Nov. 30, 2018
Proceeds from Issuance of Common Stock |  |  |  | $ 15,503,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Convertible Debt, Option Agreements, Percentage |  |  |  |  |  | 95.00% |
November 2018 ATM Offering [Member] |  |  |  |  |  |  |
At Market Issuance Sales Agreement, Maximum Aggregate Offering Price | $ 15,000,000 |  |  |  |  |  | $ 25,000,000
Stock Issued During Period, Shares, New Issues | 1,159,718 |  | 97,106 |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 15,000,000 |  | $ 1,050,000 |  |  |  |
Proceeds from Issuance of Common Stock | $ 14,600,000 |  | $ 900,000 |  |  |  |
November 2018 ATM Offering [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 782,814 |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  | $ 8,080,000 |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 7,920,000 |  |  |  |  |

X
- Definition The maximum aggregate offering price of common stock to be issued pursuant to the At Market Issuance Sales Agreement. + References No definition available. + Details
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