Note 2 - Summary of Significant Accounting Policies - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss from continuing operations, net of income taxes	$ (13,626)	$ (21,324)	$ (13,945)
Income from discontinued operations, net of income taxes	12,497	3,999	1,356
Net loss	$ (1,129)	$ (17,325)	$ (12,589)
Basic and diluted weighted average number of shares outstanding (in shares)	28,654,500	28,517,339	22,397,865
Loss from continuing operations per common share - basic and diluted (in dollars per share)	$ (0.48)	$ (0.75)	$ (0.62)
Earnings from discontinued operations per common share - basic and diluted (in dollars per share)	0.44	0.14	0.06
Loss per common share - basic and diluted (in dollars per share)	$ (0.04)	$ (0.61)	$ (0.56)

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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