Note 1 - Description of Organization and Business Operations (Details Textual)										1 Months Ended				3 Months Ended										4 Months Ended	12 Months Ended
	Feb. 21, 2020 USD ($) $ / shares shares	Feb. 06, 2020 USD ($)	Nov. 27, 2019 USD ($) shares	Oct. 17, 2019 $ / shares	Oct. 16, 2019 shares	Oct. 11, 2019 USD ($) shares	Apr. 17, 2018 USD ($) $ / shares shares	Apr. 12, 2018 USD ($) $ / shares shares	Nov. 13, 2017 USD ($) $ / shares shares	Jan. 31, 2020 shares	Nov. 30, 2019 shares	Apr. 30, 2018 shares	Mar. 31, 2018 USD ($) shares	May 21, 2020 shares	Mar. 30, 2020 shares	Dec. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 21, 2020 $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Stock Issued During Period, Value, New Issues																										$ 414,000,000
Number of Shares Transferred to Each Independent Director Nominees | shares													40,000
Number of Independent Directors													3
Number of Shares Transferred to Independent Director Nominees | shares													120,000
Common Stock Dividend Rate												0.02
Sale of Stock, Price Per Unit | $ / shares							$ 10
Proceeds from Issuance Initial Public Offering							$ 414,000,000																			$ 414,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 11.50													$ 1						$ 1
Proceeds from Issuance of Private Placement							$ 10,280,000
Proceeds from Issuance or Sale of Equity, Total							424,280,000
Investment outside Trust Account							10,280,000
Payments of Stock Issuance Costs							8,280,000																			$ 8,280,000
Repayments of Notes Payable																										200,000
Payment to Affiliates Per Month From Interest Earned							10,000
Stock Redeemed or Called During Period, Value																									36,823,301
Price Per Share of Common Stock Issued in IPO Not redeemed in Connection With Stockholder Vote to Approve Extension for Each Month | $ / shares				$ 0.033
Potential Payments for Dissolution Expenses if Business Combination not Completed																									50,000
Cash, Ending Balance																$ 179,515				$ 734,894					179,515	734,894
Investment Income, Nonoperating, Total																1,532,912	$ 2,178,777	$ 2,592,502	$ 2,434,969	$ 2,331,871	$ 1,961,856	$ 1,484,040	$ 0		8,739,160	5,777,767
Payments for Administrative Services, Related Party																									120,000	80,000
Trust Account [Member]
Income and Franchise Taxes Paid																									2,301,630
Payments for Administrative Services, Related Party																									120,000
Subsequent Event [Member]
Price Per Share of Common Stock Issued in IPO Not redeemed in Connection With Stockholder Vote to Approve Extension for Each Month | $ / shares																								$ 0.033
Debt Proceeds Used for Certain Funding, Cap Amount		$ 400,000,000
Minimum Investment in Trust Account, Net of Redemptions		150,000,000
The Company, HighPeak Energy, HighPeak Assets II and the HPK Contributors [Member] | Grenadier [Member] | Subsequent Event [Member]
Amount Payable for Second Extension in Business Combination Agreement		$ 15,000,000
Number of Installments for Second Extension Payment		4
Amount Payable for Second Extension in Business Combination Agreement, Installment One		$ 1,000,000
Amount Payable for Second Extension in Business Combination Agreement, Installment Two		5,000,000
Amount Payable for Second Extension in Business Combination Agreement, Installment Three		5,000,000
Amount Payable for Second Extension in Business Combination Agreement, Installment Four		$ 4,000,000
Grenadier Assets [Member] | HighPeak Energy Assets II, LLC [Member]
Business Combination, Estimated Payments to Acquire Businesses, Gross			$ 465,000,000
Business Acquisition, Warrants Issued or Issuable, Number of Warrants | shares			2,500,000
Grenadier Assets [Member] | HighPeak Energy Assets II, LLC [Member] | Common Stock [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares			15,760,000
High Peak Business Combination [Member] | HighPeak Energy, Inc. [Member]
Business Combination, Available Liquidity, Minimum Amount																275,000,000									275,000,000
Business Combination, Minimum Net Tangible Assets Remaining After Closing																$ 5,000,001									5,000,001
Forecast [Member] | Limited Partner Interest in HPK LP [Member] | HighPeak Energy, Inc. [Member] | Common Stock [Member]
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares														71,150,000
The Sponsor [Member]
Class of Warrant or Right, Issued During Period | shares											248,000				17,293,805
Repayments of Notes Payable							$ 200,000
The Sponsor [Member] | Subsequent Event [Member]
Class of Warrant or Right, Issued During Period | shares										17,293,805
Maximum [Member]
Investment Maturity, Term							180 days
US Treasury Securities [Member]
Investment in Trust Account							$ 414,000,000																		$ 378,060,000	$ 414,000,000
Warrants Issued in Connection with IPO [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares							1
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 11.50
Private Placement Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right | shares							1
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 11.50
Class of Warrant or Right, Issued During Period | shares							10,280,000
Class of Warrant Or Right, Purchase Price Per Warrant | $ / shares							$ 1
Warrants Issued in Connection with Private Placement [Member] | HighPeak Energy Partners Limited Partners [Member] | Forecast [Member]
Class of Warrant or Right, Issued During Period | shares														5,000,000
Warrants Issued in Connection with Private Placement [Member] | Maximum [Member] | HighPeak Energy Partners Limited Partners [Member]
Class of Warrant or Right, Issued During Period | shares								7,500,000
Warrants Issued in Connection with Private Placement [Member] | Maximum [Member] | HighPeak Energy Partners Limited Partners [Member] | Forecast [Member]
Class of Warrant or Right, Issued During Period | shares														7,500,000
Warrants Issued Pursuant to Forward Purchase Agreement Amendment [Member] | HighPeak Energy Partners Limited Partners [Member] | Forecast [Member]
Class of Warrant or Right, Issued During Period | shares														5,000,000
Warrants Tendered and Offered as Payment [Member]
Class of Warrant or Right, Issued During Period | shares					248,000
Warrants Tendered and Offered as Payment [Member] | The Sponsor [Member]
Class of Warrant or Right, Issued During Period | shares					248,000
IPO [Member]
Units Issued During Period | shares							41,400,000
Sale of Stock, Price Per Unit | $ / shares							$ 10
Sale of Stock, Number of Warrants Per Unit | shares							0.5
Private Placement [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 1									$ 1									$ 1
Private Placement [Member] | HighPeak Energy Partners Limited Partners [Member]
Sale of Stock, Price Per Unit | $ / shares								$ 10
Private Placement [Member] | Maximum [Member] | HighPeak Energy Partners Limited Partners [Member]
Aggregate Price Under Forward Purchase Agreement								$ 150,000,000
Common Class B [Member]
Stock Issued During Period, Shares, New Issues | shares									10,062,500
Sale of Stock, Price Per Share | $ / shares									$ 0.002
Stock Issued During Period, Value, New Issues									$ 25,000
Common Stock Shares Forfeiture Cost													$ 0
Common Stock Shares Forfeiture | shares													1,437,500
Shares, Outstanding, Ending Balance | shares													8,625,000
Common Stock Dividend Rate												0.2
Common Stock, Shares, Outstanding, Ending Balance | shares												10,350,000				10,350,000				10,350,000					10,350,000	10,350,000
Common Stock, Par or Stated Value Per Share | $ / shares																$ 0.0001				$ 0.0001					$ 0.0001	$ 0.0001
Common Class B [Member] | The Sponsor [Member]
Stock Issued During Period, Shares, New Issues | shares									10,062,500
Sale of Stock, Price Per Share | $ / shares									$ 0.002
Stock Issued During Period, Value, New Issues									$ 25,000
Common Stock Shares Forfeiture Cost													$ 0
Common Stock Shares Forfeiture | shares													1,437,500
Common Class A [Member]
Stock Issued During Period, Shares, New Issues | shares																									37,806,000
Common Stock, Shares, Outstanding, Ending Balance | shares																80,290				0					80,290	0
Common Stock, Par or Stated Value Per Share | $ / shares																$ 0.0001				$ 0.0001					$ 0.0001	$ 0.0001
Stock Redeemed or Called During Period, Shares | shares						3,594,000																			3,594,000
Stock Redeemed or Called During Period, Value						$ 36,823,301
Common Class A [Member] | Subsequent Event [Member]
Stock Redeemed or Called During Period, Shares | shares	2,189,801
Stock Redeemed or Called During Period, Value	$ 22,811,431
Price Per Share of Common Stock Issued in IPO Not redeemed in Connection With Stockholder Vote to Approve Extension for Each Month | $ / shares	$ 0.033
Common Class A [Member] | IPO [Member]
Sale of Stock, Number of Shares Per Unit | shares							1
Common Stock, Par or Stated Value Per Share | $ / shares							$ 0.0001
Common Class A [Member] | Private Placement [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 11.50
Common Class A [Member] | Private Placement [Member] | Maximum [Member] | HighPeak Energy Partners Limited Partners [Member]
Stock Issued During Period, Shares, New Issues | shares												15,000,000
Common Class A [Member] | Private Placement [Member] | Maximum [Member] | HighPeak Energy Partners Limited Partners [Member] | Forecast [Member]
Stock Issued During Period, Shares, New Issues | shares														15,000,000