v3.22.2.2
INVESTMENTS, Reconciliation for Investments Measurements at Fair Value on a Recurring Basis (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]   Net unrealized loss  
Level III [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Balance $ 68,877,889 $ 86,460,491 $ 70,340,043
Purchases of investments 8,830,765 13,448,477 21,789,690
Transfers to Level I (229,879) (1,900,470) (230,160)
Fair value adjustment on FSP Satellite Corp. units owned prior to consolidation (Note 1)     (3,106,018)
Consolidation of the Operating Partnership   (8,027,584)  
Proceeds from sales, net (1,922,780) (1,011,748) (33,218,158)
Return of capital distributions (6,001,052) (11,486,835) (11,807,238)
Net realized gains (160,108) 30,050 7,277,446
Net unrealized gains (losses) 945,208 (8,634,492) 6,547,639
Balance 70,340,043 68,877,889 57,593,244
Unrealized gains (losses), net included in earnings $ (945,208) $ (1,836,915) $ 8,698,216