Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($)	Sep. 30, 2015	Dec. 31, 2014	[1]
Allowance for doubtful accounts	$ 50,000	$ 60,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares outstanding (in shares)	18,159,456	18,348,556

[1] The condensed consolidated balance sheet as of December 31, 2014 has been prepared using information from the audited consolidated balance sheet as of that date.