Calculation of Basic and Diluted Earnings per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Numerator:
Net Income	$ 1,559	$ 981	$ 2,955	$ 1,656
Preferred Stock Dividends				(15)
Numerator for basic earnings per share - income available to common shareholders	1,559	981	2,955	1,641
Effect of dilutive securities:
6% Convertible Debenture Interest Expense	14	22	36	44
Preferred Stock Dividends				15
Numerator for diluted income per share - income available to common shareholders after assumed conversions	$ 1,573	$ 1,003	$ 2,991	$ 1,700
Denominator:
Denominator for basic income per share - weighted-average shares (in shares)	2,769	2,091	2,585	2,017
Effect of dilutive securities:
Employee stock options	40	46	39	40
Detachable warrants	461	577	457	536
6% Convertible Debenture	192	547	370	552
Preferred Stock		32		71
Dilutive potential common shares	693	1,202	866	1,199
Denominator for diluted income per share - weighted-average shares and assumed conversions	3,462	3,293	3,451	3,216
Basic income per common share (in dollars per share)	$ 0.56	$ 0.47	$ 1.14	$ 0.81
Diluted income per common share (in dollars per share)	$ 0.45	$ 0.30	$ 0.87	$ 0.53