Condensed Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for doubtful accounts on trade accounts receivable (in dollars)	$ 52	$ 35
Debt discount on loans payable, current (in dollars)	0	9
Debt discount on related party loans payable, current (in dollars)	$ 0	$ 13
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	6,198,294	5,902,244
Common stock, shares outstanding	6,173,294	5,877,244
Treasury stock, shares	25,000	25,000