Condensed Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Condensed Balance Sheets
Allowance for doubtful accounts on trade accounts receivable (in dollars)	$ 56	$ 36
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	6,640,833	6,556,221
Common stock, shares outstanding	6,615,833	6,531,221
Treasury stock, shares	25,000	25,000