Note 1 - Organization and Significant Accounting Policies - Calculation of Diluted Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net income (loss) attributable to common stockholders	$ 2,927	$ (2,728)
Weighted average shares outstanding used to compute basic earnings per share (in shares)	16,256,465	13,263,881
Effect of dilutive securities (in shares)	5,370,813
Weighted average diluted shares (in shares)	21,627,278	13,263,881
Basic net income (loss) per common share (in dollars per share)	$ 0.18	$ (0.21)
Diluted net income (loss) per common share (in dollars per share)	$ 0.14	$ (0.21)