Note 5 - Fair Value Measurements - Fair Value Assets by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Assets, Fair Value, Cash and Cash Equivalents	$ 306,106	$ 57,800
Assets, Fair Value, Other Current Assets	798	2,177
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents	0	1
Assets, Fair Value, Other Current Assets	200	586
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value, Cash and Cash Equivalents	757	268
Assets, Fair Value, Other Current Assets	598	1,591
Cash [Member]
Assets, Fair Value, Cash and Cash Equivalents	305,349	57,531
Assets, Fair Value, Other Current Assets	0	0
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents	0	1
Assets, Fair Value, Other Current Assets	200	0
Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents		0
Assets, Fair Value, Other Current Assets		586
Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value, Cash and Cash Equivalents	757	268
Assets, Fair Value, Other Current Assets	598	1,591
Reported Value Measurement [Member]
Assets, fair value	306,904	59,977
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	200	587
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,355	1,859
Reported Value Measurement [Member] \| Cash [Member]
Assets, fair value	305,349	57,531
Reported Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	200	1
Reported Value Measurement [Member] \| Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value		586
Reported Value Measurement [Member] \| Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,355	1,859
Estimate of Fair Value Measurement [Member]
Assets, fair value	307,104	60,239
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	200	587
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,555	2,121
Estimate of Fair Value Measurement [Member] \| Cash [Member]
Assets, fair value	305,349	57,531
Estimate of Fair Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	200	1
Estimate of Fair Value Measurement [Member] \| Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value		586
Estimate of Fair Value Measurement [Member] \| Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	$ 1,555	$ 2,121