Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Allowance for doubtful accounts	$ 59,000	$ 46,000	[1]
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	[1]
Common stock, shares authorized (in shares)	50,000,000	50,000,000	[1]
Common stock, shares outstanding (in shares)	16,301,056	17,850,456

[1] The condensed consolidated balance sheet as of December 31, 2015 has been prepared using information from the audited consolidated balance sheet as of that date.