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Note 7 - Fair Value of Financial Instruments (Details Textual) BTU in Millions, $ in Millions |  |  |  |  |  | 1 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2017 USD ($) BTU $ / BTU | Feb. 24, 2016 USD ($) Boe $ / Boe | Feb. 02, 2016 USD ($) BTU $ / BTU | May 14, 2015 BTU $ / item | Mar. 06, 2014 BTU $ / BTU | Mar. 31, 2016 Boe $ / Boe $ / item | Feb. 28, 2016 $ / Boe
Derivative, Number of Options Rolled |  |  |  |  |  | 2 |
Henry Hub Natural Gas Future ("NG") Contracts [Member] | Put Option [Member] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU | 4.1 |  |  |  |  |  |
Derivative, Price Risk Option Strike Price | $ / BTU | 3 |  |  |  |  |  |
Payments for Derivative Instrument, Investing Activities | $ | $ 0.7 |  |  |  |  |  |
Henry Hub Natural Gas Future ("NG") Contracts [Member] | Call Option [Member] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  | 4.1 |  |  |  |
Derivative, Price Risk Option Strike Price | $ / BTU |  |  | 2 |  |  |  |
Proceeds from Derivative Instrument, Investing Activities | $ |  |  | $ 1.9 |  |  |  |
Brent Oil Future Contracts [Member] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe |  | 185,000 |  |  |  |  |
Brent Oil Future Contracts [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price |  | 32.8 |  |  |  |  |
Brent Oil Future Contracts [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price |  | 35.5 |  |  |  |  |
Brent Oil Future Contracts [Member] | Call Option [Member] |  |  |  |  |  |  |
Proceeds from Derivative Instrument, Investing Activities | $ |  | $ 1.1 |  |  |  |  |
Rolled Two Existing Options [Member] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe |  |  |  |  |  | 31,800 |
Rolled Two Existing Options [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price |  |  |  |  |  | 41 |
Rolled Two Existing Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price |  |  |  |  |  | 42.5 |
Before Rolling Two Existing Options [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price |  |  |  |  |  |  | 32.8
Before Rolling Two Existing Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price |  |  |  |  |  |  | 33.5
Short Risk Reversal Transactions, Rolling Existing Call Option 1 [Member] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe |  |  |  |  |  | 16,500 |
Short Risk Reversal Transactions, Rolling Existing Call Option 1 [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price | $ / item |  |  |  |  |  | 28.5 |
Short Risk Reversal Transactions, Rolling Existing Call Option 1 [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price | $ / item |  |  |  |  |  | 37.5 |
Short Risk Reversal Transactions, Rolling Existing Call Option 2 [Member] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe |  |  |  |  |  | 17,000 |
Short Risk Reversal Transactions, Rolling Existing Call Option 2 [Member] | Minimum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price | $ / item |  |  |  |  |  | 28 |
Short Risk Reversal Transactions, Rolling Existing Call Option 2 [Member] | Maximum [Member] |  |  |  |  |  |  |
Derivative, Price Risk Option Strike Price | $ / item |  |  |  |  |  | 38.5 |
NGI Swap Contract [Member] |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU |  |  |  | 2.4 | 2.2 |  |
Underlying, Derivative Energy Measure |  |  |  | 3 | 4.95 |  |

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- Definition The cash outflow for derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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