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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Cash Flows From Operating Activities      
Net income attributable to the Company $ 8,044,313 $ 24,660,362 $ 4,991,857
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 5,775,946 5,211,494 3,664,373
Impairments included in restructuring charge 0 569,228 0
Stock-based compensation 1,180,618 1,809,548 943,653
Accretion of discount on asset retirement obligations 59,664 49,054 34,866
Settlement of asset retirement obligations (157,910) 0 (223,564)
Deferred income taxes 4,090,919 575,235 1,422,489
Deferred rent 0 0 (17,145)
(Gain) loss on derivative instruments, net (29,758) (3,439,229) 109,974
Noncash gain on Delhi field litigation settlement 0 (596,500) 0
Write-off of deferred loan costs 0 50,414 0
Changes in operating assets and liabilities:      
Receivables (88,514) 484,285 (1,665,261)
Prepaid expenses and other current assets (135,923) 24,754 378,049
Accounts payable and accrued expenses (1,626,648) 822,730 551,452
Income taxes payable (621,850) 431,818 190,032
Net cash provided by operating activities 16,490,857 30,653,193 10,380,775
Cash flows from investing activities      
Derivative settlements received (paid) (272,318) 3,633,831 0
Proceeds from asset sales 0 0 398,242
Capital expenditure for development of oil and natural gas properties (10,158,960) (21,095,901) (4,890,909)
Capital expenditures for technology and other equipment (32,260) (6,883) (313,059)
Other assets 0 (161,345) (236,559)
Net cash used by investing activities (10,463,538) (17,630,298) (5,042,285)
Cash flows from financing activities      
Proceeds from the exercise of stock options 0 51,000 141,600
Common share repurchases, including shares surrendered for tax withholding (459,858) (1,357,185) (333,841)
Cash dividends to common stockholders (8,432,435) (6,565,823) (9,833,642)
Cash dividends to preferred stockholders (250,990) (674,302) (674,302)
Redemption of preferred shares (7,932,975) 0 0
Deferred loan costs 0 (168,972) (94,075)
Tax benefits related to stock-based compensation 0 9,650,657 1,633,946
Other 32 33 67
Net cash provided (used) by financing activities (17,076,226) 935,408 (9,160,247)
Net increase (decrease) in cash and cash equivalents (11,048,907) 13,958,303 (3,821,757)
Cash and cash equivalents, beginning of year 34,077,060 20,118,757 23,940,514
Cash and cash equivalents, end of year $ 23,028,153 $ 34,077,060 $ 20,118,757