Note 5 - Financing Arrangements (Details Textual) $ in Thousands		12 Months Ended
	Apr. 15, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2022 CNY (¥)	Jun. 15, 2017 USD ($)
Gain (Loss) on Extinguishment of Debt, Total		$ 0	$ 6,171
Credit Agreement [Member] | Bank of America [Member]
Debt Issuance Costs, Net, Total		44
Paycheck Protection Program CARES Act [Member]
Proceeds from Issuance of Long-Term Debt, Total	$ 6,077
Long-Term Debt, Total		6,077
Interest Payable		93
Gain (Loss) on Extinguishment of Debt, Total		6,170
Bank of America [Member] | Credit Agreement [Member]
Long-Term Line of Credit, Total		$ 6,897	9,016
Line of Credit, Minimum Fixed Charge Coverage Ratio During the Period		1.0
Line of Credit Facility, Remaining Borrowing Capacity		$ 8,380	$ 3,539
Bank of America [Member] | Credit Agreement [Member] | Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 16,000
Debt Instrument, Interest Rate During Period		5.20%	3.50%
China Construction Bank [Member] | Line of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500		¥ 10,000,000
Long-Term Line of Credit, Total		$ 0	$ 0