Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts	$ 60,000	$ 60,000	[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)	18,219,456	18,348,556	[1]

[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.