CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Jun. 30, 2018	Jun. 30, 2017
Allowance for doubtful accounts	$ 495,000	$ 721,000
Preferred stock, par value (in US$ per share)	$ 1	$ 1
Preferred stock, shares authorized (in shares)	500,000	500,000
Liquidation Preference	$ 15,089	$ 0
Common stock, par value (in US$ per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	16,951,659	16,846,002
Common stock, shares outstanding (in shares)	16,951,659	16,846,002
Cumulative Preferred Stock [Member]
Preferred stock, shares authorized (in shares)	21,000	21,000
Preferred stock, issued (in shares)	14,700	0
Preferred Stock, outstanding (in shares)	14,700	0