Stockholders' Equity (Deficit) - Schedule of Restricted Stock Unit Activty (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
Dec. 31, 2020 $ / shares shares
Outstanding, Beginning \| shares
RSU, exercisable, Beginning \| shares
RSU, Granted \| shares	34,000
RSU, Exercised \| shares
RSU, Forfeited/Cancelled \| shares
Outstanding, Ending \| shares	34,000
RSU, Exercisable, Ending \| shares	8,500
Weighted Average Exercise Price, Outstanding, Beginning \| $ / shares
Weighted Average Exercise Price, Exercisable, Beginning \| $ / shares
Weighted Average Exercise Price, Granted \| $ / shares	4.53
Weighted Average Exercise Price, Exercised \| $ / shares
Weighted Average Exercise Price, Forfeited/cancelled \| $ / shares
Weighted Average Exercise Price, Outstanding, Ending \| $ / shares	4.53
Weighted Average Exercise Price, Exercisable, Ending \| $ / shares	$ 4.53

RSU, exercisable, ending

No definition available.

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Period Type:	instant

- Definition

RSU, exercisable, beginning.

+ References

No definition available.

+ Details

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- Definition

Weighted average exercise price, exercisable, beginning.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Weighted average exercise price, exercisable, ending.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Weighted average exercise price, exercised.

+ References

No definition available.

+ Details

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Namespace Prefix:	HCDI_
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Balance Type:	na
Period Type:	duration

- Definition

Weighted average exercise price, forfeited/cancelled.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Weighted average exercise price, granted.

+ References

No definition available.

+ Details

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Namespace Prefix:	HCDI_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average exercise price, outstanding, beginning.

+ References

No definition available.

+ Details

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Namespace Prefix:	HCDI_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average exercise price, outstanding, ending.

+ References

No definition available.

+ Details

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Namespace Prefix:	HCDI_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of non-option equity instruments exercised by participants.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares under non-option equity instrument agreements that were either cancelled or expired.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

- Definition

Net number of non-option equity instruments granted to participants.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Stockholders' Equity (Deficit) - Schedule of Restricted Stock Unit Activty (Details) - Restricted Stock Units (RSUs) [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Outstanding, Beginning \| shares
RSU, exercisable, Beginning \| shares
RSU, Granted \| shares	34,000
RSU, Exercised \| shares
RSU, Forfeited/Cancelled \| shares
Outstanding, Ending \| shares	34,000
RSU, Exercisable, Ending \| shares	8,500
Weighted Average Exercise Price, Outstanding, Beginning \| $ / shares
Weighted Average Exercise Price, Exercisable, Beginning \| $ / shares
Weighted Average Exercise Price, Granted \| $ / shares	4.53
Weighted Average Exercise Price, Exercised \| $ / shares
Weighted Average Exercise Price, Forfeited/cancelled \| $ / shares
Weighted Average Exercise Price, Outstanding, Ending \| $ / shares	4.53
Weighted Average Exercise Price, Exercisable, Ending \| $ / shares	$ 4.53