Note 10 - Equity Offerings - Summary of Sales Under Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Apr. 28, 2017
Average price per share (in dollars per share)			$ 1.00
Net proceeds	$ 13,525	$ 0
ATM Offering [Member]
Total shares of common stock sold (in shares)	6,687,846
Average price per share (in dollars per share)	$ 1.73
Gross proceeds	$ 11,558
Commissions earned by Cantor	346
Net proceeds	$ 11,212

The cash inflow from issuance of equity, net of issuance cost.

No definition available.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity.

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Per share or per unit amount of equity securities issued.

+ References

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Number of new stock issued during the period.

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