Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 137,784	$ 129,983
Accounts receivable:
Trade receivable	28,332	29,688
Joint interest billings	4,695	4,768
Income taxes	12,327	4,510
Prepaid expenses	3,086	5,762
Other	1,062	502
Total current assets	187,286	175,213
PROPERTY, PLANT AND EQUIPMENT:
Proved properties	555,680	561,713
Unproved properties	16,021	12,485
Furniture and equipment	216	213
Accumulated depreciation, depletion and amortization	(187,246)	(178,081)
Total property, plant and equipment, net	384,671	396,330
OTHER ASSETS:
Investment in affiliates	46,197	52,827
Other	255	284
TOTAL ASSETS	618,409	624,654
CURRENT LIABILITIES:
Accounts payable	4,488	3,084
Royalties and revenue payable	18,709	22,098
Accrued liabilities	5,319	6,796
Accrued exploration and development	32,611	2,334
Total current liabilities	61,127	34,312
DEFERRED TAX LIABILITY	110,778	118,010
ASSET RETIREMENT OBLIGATION	9,714	7,993
SHAREHOLDERS' EQUITY:
Common stock, $0.04 par value, 50 million shares authorized, 20,135,107 shares issued and 15,292,448 shares outstanding at June 30, 2012, 20,135,107 shares issued and 15,664,666 shares outstanding at June 30, 2011	805	805
Additional paid-in capital	79,024	79,024
Treasury stock at cost (4,842,659 shares at June 30, 2012 and 4,470,441 shares at June 30, 2011)	(112,207)	(112,207)
Retained earnings	469,168	496,717
Total shareholders' equity	436,790	464,339
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 618,409	$ 624,654