Calculation of Basic and Diluted Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator:
Net Income	$ 1,837	$ 1,067	$ 4,792	$ 2,723
Preferred Stock Dividends				(15)
Numerator for basic earnings per share - income available to common shareholders	1,837	1,067	4,792	2,708
Effect of dilutive securities:
6% Convertible Debenture Interest Expense		22	36	66
Preferred Stock Dividends				15
Numerator for diluted income per share - income available to common shareholders after assumed conversions	$ 1,837	$ 1,089	$ 4,828	$ 2,789
Denominator:
Denominator for basic income per share - weighted-average shares	2,968	2,122	2,714	2,052
Effect of dilutive securities:
Employee stock options	(180)	37	(158)	40
Detachable warrants	461	555	457	542
6% Convertible Debenture	192	547	370	552
Preferred Stock		3		48
Dilutive potential common shares	473	1,142	669	1,182
Denominator for diluted income per share - weighted-average shares and assumed conversions	3,441	3,264	3,383	3,234
Basic income per common share (in dollars per share)	$ 0.62	$ 0.50	$ 1.77	$ 1.32
Diluted income per common share (in dollars per share)	$ 0.53	$ 0.33	$ 1.43	$ 0.86