Consolidated Balance Sheets (Parentheticals) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Convertible preferred stock, Series B, shares authorized	10,000,000	10,000,000
Convertible preferred stock, Series B, shares issued	35,000	35,000
Convertible preferred stock, Series B, shares outstanding	34,900	34,900
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	24,694,241	24,658,985
Common stock, shares outstanding	18,418,903	18,060,206
Treasury stock, shares	6,275,338	6,598,779