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Recent Real Estate Transactions (Tables) | 12 Months Ended
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Dec. 31, 2017
Real Estate [Abstract] |
Properties Acquired and Sold | The Company allocated the purchase price of the properties acquired during 2017 as follows:
|  |  |  |  |  | Buildings |  |  | Total |
|  | Land |  |  | and Other |  |  | Purchase Price |
Model Homes Properties |  | $ | 2,980,108 |  |  | $ | 14,580,637 |  |  | $ | 17,560,745 |
|  | $ | 2,980,108 |  |  | $ | 14,580,637 |  |  | $ | 17,560,745 |

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- Definition Tabular disclosure of the properties acquired and sold during the period. + References No definition available. + Details
Name: | sqft_PropertiesAcquiredAndSoldTableTextBlock
Namespace Prefix: | sqft_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration