Note 5 - Investment Securities Available for Sale (Details Textual) - USD ($)		3 Months Ended				9 Months Ended		12 Months Ended
	Nov. 28, 2016	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2016
Marketable Securities		$ 6,073,000				$ 6,073,000		$ 9,656,000
Available-for-sale Securities, Amortized Cost Basis		5,598,000				5,598,000		9,791,000
Available-for-sale Securities, Gross Unrealized Gain						614,000		422,000
Available-for-sale Securities, Gross Unrealized Loss						139,000		557,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value		613,000				613,000		5,903,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss						139,000		163,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		12				12		4,711,000
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss						12		$ 395,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net						1,502,239
Available-for-sale Securities, Gross Realized Gains						583,000	0
Insignia [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.70
Insignia [Member]
Available-for-sale Securities, Gross Unrealized Gain						430,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value		4,034,000	$ 3,604,000			4,034,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net			$ 1,502,000		$ 0		$ 0
Investment Income, Dividend		$ 0				$ 0