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Share-Based Incentive Plan - Additional Information (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2006 | Dec. 31, 2018 | Dec. 31, 2017
Share-Based Incentive Plan [Abstract] |  |  |
Value of granted nonvested restricted stock issued |  | $ 2,058,000 | $ 1,390,000
Compensation expense |  | $ 461,000 | $ 559,000
Non Vested Restricted Shares | Minimum [Member] |  |  |
Share-Based Incentive Plan [Abstract] |  |  |
Vesting period |  | 1 year |
Non Vested Restricted Shares | Maximum [Member] |  |  |
Share-Based Incentive Plan [Abstract] |  |  |
Vesting period |  | 10 years |
Restricted Stock Plan [Member] | Restricted Stock [Member] | Private Placement [Member] |  |  |
Share-Based Incentive Plan [Abstract] |  |  |
Offering price (in dollars per share) | $ 8.60 | $ 10.00 |
Restricted Stock Plan [Member] | Restricted Stock [Member] | Minimum [Member] |  |  |
Share-Based Incentive Plan [Abstract] |  |  |
Vesting period |  | 3 years |
Restricted Stock Plan [Member] | Restricted Stock [Member] | Maximum [Member] |  |  |
Share-Based Incentive Plan [Abstract] |  |  |
Vesting period |  | 10 years |

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- Definition The offering price as adjusted for stock dividends since granted and assumed selling costs. + References No definition available. + Details
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Namespace Prefix: | sqft_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The value of restricted shares issued as compensation, net of the value of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes. + References No definition available. + Details
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Balance Type: | credit
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Details
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- Details
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Namespace Prefix: |
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- Details
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- Details
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- Details
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- Details
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