Note 5 - Investment Securities Available for Sale (Details Textual) - USD ($)	3 Months Ended				9 Months Ended		12 Months Ended
	Dec. 31, 2015	Mar. 31, 2015		Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2015
Marketable Securities	$ 8,666,000				$ 8,666,000
Available-for-sale Securities, Amortized Cost Basis	8,706,000	$ 5,490,000			8,706,000		$ 5,490,000
Available-for-sale Securities, Gross Unrealized Gain					477,000		0
Available-for-sale Securities, Gross Unrealized Loss					517,000		211,000
Marketable Securities, Current	3,921,690	5,278,752			3,921,690		5,278,752
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	6,255,000	4,168,000			6,255,000		4,168,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss		176,000			517,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss		35,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		1,111,000					1,111,000
Available-for-sale Securities, Gross Realized Gains	859			$ 78	859	$ 8,487
Available-for-sale Securities, Gross Realized Losses					7,696	$ 0
Available-for-sale Securities, Noncurrent	4,744,406		[1]		4,744,406			[1]
Insignia [Member]
Available-for-sale Securities, Gross Unrealized Loss					362,000
Available-for-sale Securities, Noncurrent	$ 5,106,000				$ 5,106,000

[1] Derived from audited consolidated financial statements