CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Jun. 30, 2015	Jun. 30, 2014
Allowance for doubtful accounts on trade receivables (in dollars)	$ 16,296	$ 16,508
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)	$ 2,220,000	$ 2,190,000
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)	$ 2,175,000	$ 2,145,000
Cumulative preferred stock, $20 par value | Series A
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Preferred stock, liquidation preference (in dollars)	$ 5,019,197	$ 4,960,664
Cumulative preferred stock, $20 par value | Series B
Preferred stock, par value (in dollars per share)	$ 20	$ 20
Preferred stock, liquidation preference (in dollars)	$ 817,977	$ 808,438