Investments (Details Textual) (USD $)	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Fair value	$ 11,148,000	$ 10,184,000
Investments (Narrative) [Abstract]
Value of investments to be other-than-temporarily impaired	0
Gross gains realized	31,000
Gross losses realized	1,000
Common stock of industrial and other companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,500,000
Total unrealized losses	121,000
Common stock of bank trust, insurance, and public utility companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,500,000
Total unrealized losses	$ 10,000