Note 3 - Net Earnings Per Share (Detail) - The Computation of Basic and Diluted Earnings per Common Share is as Follows: (USD $)	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net earnings (in Dollars)	$ 632,760	$ 578,728	$ 1,277,205	$ 1,339,600
Earnings Per Share:
Basic (in Dollars per share)	$ 0.26	$ 0.24	$ 0.52	$ 0.55
Diluted (in Dollars per share)	$ 0.26	$ 0.24	$ 0.52	$ 0.55
Weighted Average Shares Outstanding:
Basic	2,446,286	2,446,286	2,446,286	2,442,959
Diluted	2,447,349	2,446,286	2,450,837	2,447,440