CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Dec. 31, 2016	Jun. 30, 2016
Allowance for doubtful accounts on trade receivables (in dollars)	$ 17,149	$ 16,549
Common stock, par value (in dollars per share)	$ 1	$ 1
Prior Cumulative Preferred Stock, $5 Par Value: | Series A
Preferred stock, par value (in dollars per share)	$ 5	$ 5
Preferred stock, liquidation preference (in dollars)	$ 2,265,000	$ 2,250,000
Prior Cumulative Preferred Stock, $5 Par Value: | Series B
Preferred stock, par value (in dollars per share)	$ 5	$ 5
Preferred stock, liquidation preference (in dollars)	$ 2,220,000	$ 2,205,000
Cumulative Preferred Stock, $20 Par Value: | Series A
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Preferred stock, liquidation preference (in dollars)	$ 5,106,997	$ 5,077,730
Cumulative Preferred Stock, $20 Par Value: | Series B
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Preferred stock, liquidation preference (in dollars)	$ 832,285	$ 827,516