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Consolidated Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities    
Net income attributable to the Company $ 2,140,532 $ 1,816,775
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 1,532,610 1,287,523
Stock-based compensation 487,484 311,688
Accretion of discount on asset retirement obligations 21,579 13,224
Settlements of asset retirement obligations 0 (15,899)
Deferred income taxes 19,513 708,673
Loss on derivative instruments, net 0 14,042
Changes in operating assets and liabilities:    
Receivables (300,581) 119,808
Prepaid expenses and other current assets 96,296 (21,365)
Accounts payable and accrued expenses (166,904) (2,235,240)
Income taxes payable 370,745 (524,772)
Net cash provided by operating activities 4,201,274 1,474,457
Cash flows from investing activities    
Derivative settlement payments (paid) received 0 (318,708)
Capital expenditures for oil and natural gas properties (508,042) (4,818,816)
Capital expenditures for other property and equipment 0 (26,347)
Net cash used in investing activities (508,042) (5,163,871)
Cash flows from financing activities    
Cash dividends to preferred stockholders 0 (168,575)
Cash dividends to common stockholders (2,481,471) (1,652,290)
Common share repurchases, including shares surrendered for tax withholding (110,753) (330,070)
Net cash used in financing activities (2,592,224) (2,150,935)
Net increase (decrease) in cash and cash equivalents 1,101,008 (5,840,349)
Cash and cash equivalents, beginning of period 23,028,153 34,077,060
Cash and cash equivalents, end of period 24,129,161 28,236,711
Supplemental disclosures of cash flow information:    
Income taxes paid 0 787,366
Non-cash transactions:    
Change in accounts payable used to acquire property and equipment 114,729 (2,030,485)
Accrued redemption of called preferred shares 0 7,932,975
Accrued preferred dividends through redemption date $ 0 $ 82,415