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Note 9 - Fixed Assets | 12 Months Ended
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Dec. 31, 2023
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | 9. Fixed Assets The following is a summary of fixed assets:
|  | Useful Life (in years) |  | Cost |  |  | Accumulated Depreciation and Amortization |  |  | Net |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Furniture and office equipment |  | 3 - 10 |  | $ | 178.5 |  |  | $ | (156.7 | ) |  | $ | 21.8 |
Leasehold improvements |  | Lease term |  |  | 116.5 |  |  |  | (63.0 | ) |  |  | 53.5 |
Purchased software |  | 3 |  |  | 59.9 |  |  |  | (55.2 | ) |  |  | 4.7 |
Software development costs |  | 3 - 7 |  |  | 1,136.6 |  |  |  | (653.0 | ) |  |  | 483.6 |
Leased equipment |  | 3 - 4 |  |  | 105.1 |  |  |  | (63.8 | ) |  |  | 41.3 |
Total fixed assets |  |  |  | $ | 1,596.6 |  |  | $ | (991.7 | ) |  | $ | 604.9 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Furniture and office equipment |  | 3 - 10 |  | $ | 199.2 |  |  | $ | (177.1 | ) |  | $ | 22.1 |
Leasehold improvements |  | Lease term |  |  | 118.3 |  |  |  | (54.6 | ) |  |  | 63.7 |
Purchased software |  | 3 |  |  | 65.1 |  |  |  | (61.0 | ) |  |  | 4.1 |
Software development costs |  | 3 - 7 |  |  | 945.4 |  |  |  | (504.5 | ) |  |  | 440.9 |
Leased equipment |  | 3 - 4 |  |  | 64.4 |  |  |  | (53.7 | ) |  |  | 10.7 |
Total fixed assets |  |  |  | $ | 1,392.4 |  |  | $ | (850.9 | ) |  | $ | 541.5 |
Depreciation and amortization of fixed assets for the years ended December 31, 2023, 2022, and 2021 were $206.8 million, $164.2 million, and $170.3 million, of which $165.5 million, $116.6 million, and $111.6 million related to amortization of internal-use software development costs, respectively. Amortization expense related to development of software for sale in accordance with ASC 985-20 was $4.8 million, $7.6 million, and $11.7 million for the years ended December 31, 2023, 2022, and 2021, respectively. We had unamortized software development costs that had been capitalized in accordance with ASC 350-40 of $482.4 million and $389.1 million as of December 31, 2023 and 2022, respectively. We had unamortized software development costs that had been capitalized in accordance with ASC 985-20 of $1.2 million and $51.7 million as of December 31, 2023 and 2022, respectively. Leased assets include amounts held under finance leases for automobiles, computer software, and computer equipment.

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