4. Earnings Per Common Share: Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 669,790	$ 418,453	$ 1,400,518	$ 879,500
Preferred Stock Dividends and Other Adjustments	110,000	110,000	220,000	220,000
Net Income Available To Common Shareholders	$ 559,790	$ 308,453	$ 1,180,518	$ 659,500