Note 5 - Fair Value Measurements - Fair Value Assets by Investment Category (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets, Fair Value, Cash and Cash Equivalents	$ 59,446	$ 57,800
Assets, Fair Value, Other Current Assets	1,363	2,177
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents	0	1
Assets, Fair Value, Other Current Assets	394	586
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value, Cash and Cash Equivalents	864	268
Assets, Fair Value, Other Current Assets	969	1,591
Cash [Member]
Assets, Fair Value, Cash and Cash Equivalents	58,582	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		1
Assets, Fair Value, Other Current Assets		0
Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value, Cash and Cash Equivalents	0	0
Assets, Fair Value, Other Current Assets	394	586
Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value, Cash and Cash Equivalents	864	268
Assets, Fair Value, Other Current Assets	969	1,591
Reported Value Measurement [Member]
Assets, fair value	60,810	59,977
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	587
Reported Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,834	1,859
Reported Value Measurement [Member] \| Cash [Member]
Assets, fair value	58,582	57,531
Reported Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value		1
Reported Value Measurement [Member] \| Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	586
Reported Value Measurement [Member] \| Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	1,834	1,859
Estimate of Fair Value Measurement [Member]
Assets, fair value	61,017	60,239
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	587
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	2,041	2,121
Estimate of Fair Value Measurement [Member] \| Cash [Member]
Assets, fair value	58,582	57,531
Estimate of Fair Value Measurement [Member] \| Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value		1
Estimate of Fair Value Measurement [Member] \| Money Market Funds, Rabbi Trust [Member] \| Fair Value, Inputs, Level 1 [Member]
Assets, fair value	394	586
Estimate of Fair Value Measurement [Member] \| Certificates of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Assets, fair value	$ 2,041	$ 2,121