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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Cash Flows From Operating Activities      
Net income attributable to the Company $ 19,618,484 $ 8,044,313 $ 24,660,362
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 6,068,265 5,775,946 5,211,494
Impairments included in restructuring charge 0 0 569,228
Stock-based compensation 1,366,764 1,180,618 1,809,548
Accretion of discount on asset retirement obligations 90,290 59,664 49,054
Settlement of asset retirement obligations 0 (157,910) 0
Deferred income taxes (5,270,856) 4,090,919 575,235
Gain on derivative instruments, net 0 (29,758) (3,439,229)
Noncash gain on Delhi field litigation settlement 0 0 (596,500)
Write-off of deferred loan costs 0 0 50,414
Changes in operating assets and liabilities:      
Receivables (1,215,214) (88,514) 484,285
Prepaid expenses and other current assets (136,835) (135,923) 24,754
Accounts payable and accrued expenses (107,081) (1,626,648) 822,730
Income taxes payable 122,760 (621,850) 431,818
Net cash provided by operating activities 20,536,577 16,490,857 30,653,193
Cash flows from investing activities      
Derivative settlements received (paid) 0 (272,318) 3,633,831
Development of oil and natural gas properties (3,690,845) (10,158,960) (21,095,901)
Capital expenditures for other property and equipment (7,846) (32,260) (6,883)
Other assets (19,282) 0 (161,345)
Net cash used by investing activities (3,717,973) (10,463,538) (17,630,298)
Cash flows from financing activities      
Proceeds from the exercise of stock options 0 0 51,000
Common share repurchases, including shares surrendered for tax withholding (571,083) (459,858) (1,357,185)
Common stock dividends paid (11,594,541) (8,432,435) (6,565,823)
Preferred stock dividends paid 0 (250,990) (674,302)
Redemption of preferred shares 0 (7,932,975) 0
Deferred loan costs 0 0 (168,972)
Tax benefits related to stock-based compensation 0 0 9,650,657
Other 0 32 33
Net cash provided (used) by financing activities (12,165,624) (17,076,226) 935,408
Net increase (decrease) in cash, cash equivalents and restricted cash 4,652,980 (11,048,907) 13,958,303
Cash, cash equivalents and restricted cash, beginning of year 23,028,153 34,077,060 20,118,757
Cash, cash equivalents and restricted cash, end of year $ 27,681,133 $ 23,028,153 $ 34,077,060