Note 5 - Marketable Securities (Details Textual)	9 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)
Corporate Bond Securities [Member] | Maximum [Member]
Severity of Unrealized Loss, Percentage of Adjusted Cost	1.00%
Corporate Bond Securities [Member]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year	1
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ 153,811	$ 16,371
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 2,583,664	2,590,240
Number of Other-than-temporarily Impaired Marketable Securities	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss	$ 153,811	16,371
Number of Corporate Bonds Resulted in Loss	13
Number of Corporate Bonds	28
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	$ 2,583,664	$ 2,590,240