Note 5 - Marketable Securities (Details Textual) - USD ($) $ / shares in Units, shares in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 06, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017	Jun. 30, 2016	Jun. 29, 2016
Marketable Securities			$ 4,594,000	$ 4,177,000		$ 4,594,000
Available-for-sale Securities, Amortized Cost Basis			4,331,000	4,294,000		4,331,000
Available-for-sale Securities, Gross Unrealized Gain				170,000		279,000
Available-for-sale Securities, Gross Unrealized Loss				287,000		16,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value				1,518,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss				$ 286,000
Available-for-sale Securities, Number of Shares				1,820
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net				$ 771,173	$ 1,502,239
Insignia [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.70
Insignia [Member]
Available-for-sale Securities, Amortized Cost Basis		$ 1,724,000	2,463,000			$ 2,463,000	$ 3,604,000	$ 5,106,000
Available-for-sale Securities, Ownership Percentage				15.00%
Available-for-sale Securities, Acquired During Period, Amortized Cost Basis		32,000
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net		$ 3,414,000
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities			$ 112,000