Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Dec. 31, 2018	Jun. 30, 2018
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Voting Common Stock [Member]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	8,236,917	8,056,527
Common stock, shares outstanding (in shares)	8,236,917	8,056,527
Nonvoting Common Stock [Member]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	3,000,000	3,000,000
Common stock, shares issued (in shares)	811,946	882,314
Common stock, shares outstanding (in shares)	811,946	882,314