Note F - Supplemental Cash Flow Information (Details Textual) - USD ($)	3 Months Ended	9 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Transfer of Ownership of Life Insurance Policy to Retired Officer [Member]
Other Significant Noncash Transaction, Value of Consideration Given	$ 383,000
Interest Paid, Net		$ 0	$ 0
Income Taxes Paid		162,000	688,000
Dividends Payable, Current	$ 67,994	$ 67,994	$ 135,989	$ 67,994