Investments (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Investments (Narrative) [Abstract]
Value of investments to be other-than-temporarily impaired		$ 0
Gross gains realized	25,000	56,000
Gross losses realized	13,000	14,000
Common stock of industrial and other companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,600,000	2,600,000
Total unrealized losses	91,000	91,000
Common stock of bank trust, insurance, and public utility companies [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,500,000	1,500,000
Total unrealized losses	$ 12,000	$ 12,000