Note 1 - Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2025 USD ($) shares	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($) shares
Number of Operating Segments	3
Number of Reportable Segments	3
Federal Fiscal Market Capitalization	$ 35,361.44
Accounts Receivable, Allowance for Credit Loss, Current	3,300,000	$ 3,500,000
Operating Lease, Impairment Loss	0	4,968,000	$ 13,000
Goodwill	996,696,000	970,558,000	662,995,000
Goodwill, Impairment Loss	0	0	0
Intangible Assets, Net (Excluding Goodwill)	102,410,000	109,643,000
Impairment of Intangible Assets (Excluding Goodwill)	0	0	0
Deductible Component of Workers Compensation	400,000
Workers' Compensation Liability, Current	13,680,000	13,644,000
Workers Compensation, Insurance Receivable	500,000	800,000
Share-Based Payment Arrangement, Noncash Expense	$ 16,424,000	$ 11,165,000	$ 10,319,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares) | shares	296,000	406,000	455,000
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Noncash Expense	$ 400,000	$ 500,000	$ 900,000
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) | shares	208,000	259,000	234,000
Restricted Stock [Member]
Share-Based Payment Arrangement, Noncash Expense	$ 16,000,000	$ 10,700,000	$ 9,400,000
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements (in shares) | shares	131,000	115,000	82,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number (in shares) | shares	381,000	244,000	201,000
Capital One, National Association [Member]
Long-Term Line of Credit	$ 7,900,000	$ 8,000,000
Selling, General and Administrative Expenses [Member]
Operating Lease, Impairment Loss	$ 0	5,000,000	$ 13,000
Minimum [Member]
Lessee, Operating Lease, Termination and Renewal Term (Year)	1 year
Finite-Lived Intangible Asset, Useful Life (Year)	1 year
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	3 years
Maximum [Member]
Lessee, Operating Lease, Termination and Renewal Term (Year)	5 years
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	15 years
Medicare [Member]
Contract with Customer, Liability	$ 1,700,000	$ 1,700,000