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Note 6 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands					6 Months Ended		12 Months Ended
	May 15, 2026	May 13, 2026	May 04, 2026	Apr. 15, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.00015		$ 0.00015
Secondary Offering [Member]
Stock Issued During Period, Shares, New Issues (in shares)		1,946,630
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.00015
Proceeds from Issuance of Common Stock	$ 81,800				$ 81,791	$ 0
Payments of Stock Issuance Costs	3,900				3,860
Secondary Offering [Member] \| Advantest [Member]
Stock Issued During Period, Shares, New Issues (in shares)		3,306,924
Shares Issued, Price Per Share (in dollars per share)		$ 44
Proceeds from Issuance of Common Stock	$ 0
Over-Allotment Option [Member]
Stock Issued During Period, Shares, New Issues (in shares)		685,246
The 2024 Program [Member]
Share Repurchase Program, Authorized, Amount				$ 40,000
Share Repurchase Program, Period in Force (Year)				2 years
Treasury Stock, Shares, Acquired (in shares)							12,500
Shares Acquired, Average Cost Per Share (in dollars per share)							$ 19.55
Treasury Stock, Value, Acquired, Cost Method							$ 200
The 2026 Program [Member]
Share Repurchase Program, Authorized, Amount			$ 50,000
Share Repurchase Program, Period in Force (Year)			2 years
Share Repurchase Program, Remaining Authorized, Amount					$ 50,000