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Note 2 - Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Basic shares (in shares)									6,173,450	6,149,192
Dilutive shares (in shares)									318,001	272,550
Diluted shares (in shares)									6,491,451	6,421,742
Net income (loss)	$ (1,866)	$ 635	$ 416	$ 404	$ (105)	$ 550	$ 462	$ 317	$ (411)	$ 1,224
Basic net income per share (in dollars per share)	$ (0.30)	$ 0.10	$ 0.07	$ 0.07	$ (0.02)	$ 0.09	$ 0.08	$ 0.05	$ (0.07)	$ 0.20
Diluted net income per share (in dollars per share)	$ (0.29)	$ 0.10	$ 0.06	$ 0.06	$ (0.02)	$ 0.09	$ 0.07	$ 0.05	$ (0.06)	$ 0.19

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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