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Note 4 - Fair Value Measurements - Reconciliation of Activity of Level 3 Investments (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Fair Value $ 301,603,725 $ 287,574,298
Purchases 5,621,831  
Maturities or Prepayments (14,395,169) (39,059,632)
Transfer 0  
Accretion of discounts/ Payment-in-kind interest 20,059,853 20,275,150
Net change in unrealized appreciation (depreciation) (34,855,545) (13,643,894)
Net change in realized appreciation (depreciation) (4,417,913) (4,008,719)
Fair Value 273,616,782 301,603,725
Purchases   50,466,522
Senior Secured Term Loan [Member]    
Fair Value 119,374,062 106,899,154
Purchases 0  
Maturities or Prepayments (3,280,767) (7,943,682)
Transfer (4,472,658)  
Accretion of discounts/ Payment-in-kind interest 10,347,606 11,433,248
Net change in unrealized appreciation (depreciation) (13,200,462) (1,014,658)
Net change in realized appreciation (depreciation) (3,683,053) 0
Fair Value 105,084,728 119,374,062
Purchases   10,000,000
Senior Secured Term Loan Participations [Member]    
Fair Value 132,290,743 129,917,253
Purchases 5,365,089  
Maturities or Prepayments (10,612,301) (32,173,020)
Accretion of discounts/ Payment-in-kind interest 8,656,977 7,374,035
Net change in unrealized appreciation (depreciation) (16,009,961) (8,245,871)
Net change in realized appreciation (depreciation) 0 (1,901,566)
Fair Value 119,690,547 132,290,743
Purchases   37,319,912
Senior Secured Trade Finance Participations [Member]    
Fair Value 45,092,689 45,800,210
Purchases 256,742  
Maturities or Prepayments (502,101) 1,057,070
Transfer (8,784,433)  
Accretion of discounts/ Payment-in-kind interest 1,055,270 1,467,867
Net change in unrealized appreciation (depreciation) (4,672,684) (4,271,915)
Net change in realized appreciation (depreciation) (734,860) (2,107,153)
Fair Value 31,710,623 45,092,689
Purchases   3,146,610
Other Investment Companies [Member]    
Fair Value 3,758,063 3,758,063
Purchases 0  
Maturities or Prepayments 0 0
Transfer 13,257,091  
Accretion of discounts/ Payment-in-kind interest 0 0
Net change in unrealized appreciation (depreciation) (1,089,773) 0
Net change in realized appreciation (depreciation) 0 0
Fair Value 15,925,381 3,758,063
Purchases   0
Warrant [Member]    
Fair Value 1,088,168 1,199,618
Purchases 0  
Maturities or Prepayments 0 0
Accretion of discounts/ Payment-in-kind interest 0 0
Net change in unrealized appreciation (depreciation) 117,335 (111,450)
Net change in realized appreciation (depreciation) 0 0
Fair Value $ 1,205,503 1,088,168
Purchases   $ 0