Note 11 - Financing Transactions - Summary of Sales Under Offering (Details) - The 2021 ATM Offering [Member] $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) $ / shares shares
Total shares of common stock sold (in shares) \| shares	19,120,037
Average price per share (in dollars per share) \| $ / shares	$ 1.47
Gross proceeds	$ 28,100
Commission earned by Sales Agents	843
Net proceeds	$ 27,257

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

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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.

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Number of new stock issued during the period.

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