v3.26.1
Note 5 - Transactions With Affiliated Companies - Investments in Controlled Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Investments, fair value $ 647,244  
Interest Income, Operating, Paid in Kind 1,278 $ 285
Net unrealized depreciation on non-affiliate investments (4,600) (32,156)
Investments, fair value 695,697  
Net realized (loss) gain on investments (161) 1
Net realized gain (loss) (161) 1
Investment, Affiliated Issuer, Noncontrolled [Member]    
Investments, fair value 63,144 8,307
Purchases 4 2
Reductions (243) 0
Interest Income, Operating, Paid in Kind 841 0
Transfers in/(out) at fair value 0 0
Discount accretion 306 0
Net unrealized depreciation on non-affiliate investments 150 (2)
Investments, fair value 64,202 8,307
Interest Income, Net 1,572  
Net realized (loss) gain on investments 0 0
Interest income 731 0
Net realized gain (loss) 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Aulea Medical, Inc. [Member]    
Investments, fair value 0 0
Purchases 0 0
Reductions 0 0
Interest Income, Operating, Paid in Kind 0 0
Transfers in/(out) at fair value 0 0
Discount accretion 0 0
Net unrealized depreciation on non-affiliate investments 0 0
Investments, fair value 0 0
Interest Income, Net 0  
Interest income   0
Investment, Affiliated Issuer, Noncontrolled [Member] | Evelo Biosciences, Inc. [Member]    
Investments, fair value 1,486 8,307
Purchases 0 2
Reductions 0 0
Interest Income, Operating, Paid in Kind 0 0
Transfers in/(out) at fair value 0 0
Discount accretion 0 0
Net unrealized depreciation on non-affiliate investments (2)
Investments, fair value 1,486 8,307
Interest Income, Net 0  
Net realized (loss) gain on investments 0 0
Interest income   0
Net realized gain (loss) 0 0
Investment, Affiliated Issuer, Noncontrolled [Member] | Hound Labs II, LLC [Member]    
Investments, fair value 11,369  
Purchases 0  
Reductions 0  
Interest Income, Operating, Paid in Kind 219  
Transfers in/(out) at fair value 0  
Discount accretion 0  
Net unrealized depreciation on non-affiliate investments (15)  
Investments, fair value 11,573  
Interest Income, Net 219  
Net realized (loss) gain on investments 0  
Net realized gain (loss) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Nexii Building Solutions, Inc [Member]    
Investments, fair value 0  
Purchases 4  
Reductions 0  
Interest Income, Operating, Paid in Kind 0  
Transfers in/(out) at fair value 0  
Discount accretion 0  
Net unrealized depreciation on non-affiliate investments (4)  
Investments, fair value 0  
Interest Income, Net 27  
Net realized (loss) gain on investments 0  
Net realized gain (loss) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | NextCar Holding Company, Inc [Member]    
Investments, fair value 1,079  
Purchases 0  
Reductions (243)  
Interest Income, Operating, Paid in Kind 0  
Transfers in/(out) at fair value 0  
Discount accretion 0  
Net unrealized depreciation on non-affiliate investments 169  
Investments, fair value 1,005  
Interest Income, Net 55  
Net realized (loss) gain on investments 0  
Net realized gain (loss) 0  
Investment, Affiliated Issuer, Noncontrolled [Member] | Shengrow Inc. [Member]    
Investments, fair value 49,210  
Purchases 0  
Reductions 0  
Interest Income, Operating, Paid in Kind 622  
Transfers in/(out) at fair value 0  
Discount accretion 306  
Net unrealized depreciation on non-affiliate investments 0  
Investments, fair value 50,138  
Interest Income, Net 1,271  
Net realized (loss) gain on investments 0  
Net realized gain (loss) 0  
Investment, Affiliated Issuer, Controlled [Member]    
Investments, fair value   31,819
Purchases   2,950
Reductions   0
Interest Income, Operating, Paid in Kind 0 208
Transfers in/(out) at fair value   0
Discount accretion   9
Net unrealized depreciation on non-affiliate investments $ 0 (20,117)
Investments, fair value   14,869
Interest Income, Net   (61)
Net realized (loss) gain on investments   0
Net realized gain (loss)   0
Investment, Affiliated Issuer, Controlled [Member] | Better Place Forests Co. [Member]    
Investments, fair value   0
Purchases   941
Reductions   0
Interest Income, Operating, Paid in Kind   0
Transfers in/(out) at fair value   0
Discount accretion   0
Net unrealized depreciation on non-affiliate investments   (62)
Investments, fair value   879
Interest Income, Net   0
Net realized (loss) gain on investments   0
Net realized gain (loss)   0
Investment, Affiliated Issuer, Controlled [Member] | HIMV LLC [Member]    
Investments, fair value   6,230
Purchases   0
Reductions   0
Interest Income, Operating, Paid in Kind   0
Transfers in/(out) at fair value   0
Discount accretion   0
Net unrealized depreciation on non-affiliate investments   (940)
Investments, fair value   5,290
Interest Income, Net   0
Net realized (loss) gain on investments   0
Net realized gain (loss)   0
Investment, Affiliated Issuer, Controlled [Member] | Nexii Building Solutions, Inc [Member]    
Investments, fair value   8,547
Purchases   0
Reductions   0
Interest Income, Operating, Paid in Kind   0
Transfers in/(out) at fair value   0
Discount accretion   0
Net unrealized depreciation on non-affiliate investments   153
Investments, fair value   8,700
Interest Income, Net   20
Net realized (loss) gain on investments   0
Net realized gain (loss)   0
Investment, Affiliated Issuer, Controlled [Member] | Swift Health Systems Inc. [Member]    
Investments, fair value   17,042
Purchases   2,009
Reductions   0
Interest Income, Operating, Paid in Kind   208
Transfers in/(out) at fair value   0
Discount accretion   9
Net unrealized depreciation on non-affiliate investments   (19,268)
Investments, fair value   0
Interest Income, Net   (81)
Net realized (loss) gain on investments   0
Net realized gain (loss)   $ 0