Note 4 - Marketable Securities (Details) (USD $)	3 Months Ended		6 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2014	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Marketable Securities, Current	$ 4,847,888		$ 4,847,888	$ 1,460,518
Available-for-sale Securities, Amortized Cost Basis	4,989,000		4,989,000	1,471,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax	17,000		17,000	16,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	158,000		158,000	27,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	4,543,000		4,543,000
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments	$ 0	$ 8,410	$ 8,410