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Note 2 - Summary of Significant Accounting Policies - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net loss	$ (5,824)	$ (11,039)	$ (9,658)
Less: Preferred deemed dividend	735	0	800
Less: Retained earnings reduction related to warrants down round feature triggered	0	0	29
Net loss attributable to common stockholders, basic and diluted	$ (6,559)	$ (11,039)	$ (10,487)
Weighted average shares outstanding, basic and diluted (in shares)	43,657	35,076	21,641
Net loss per share, basic and diluted (in dollars per share)	$ (150)	$ (310)	$ (480)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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