FINANCING ARRANGEMENTS: Schedule of Long-term Debt (Details) - USD ($)	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt	$ 121,096,000	$ 120,599,000
Senior Notes | Senior Term Notes, net
Debt Instrument [Line Items]
Interest rate percentage	5.50%		5.50%
Long-term debt	$ 121,096,000	120,599,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 0