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Note 4 - Financing Arrangements (Details Textual)	12 Months Ended
Note 4 - Financing Arrangements (Details Textual)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 29, 2024 USD ($)	Jan. 01, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Jun. 15, 2017 USD ($)
Credit Agreement [Member] \| Bank of America [Member]
Debt Issuance Costs, Net	$ 31,000
Line of Credit [Member] \| China Construction Bank [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,400,000,000				¥ 10,000,000
Debt Instrument, Interest Rate During Period	4.00%
Long-Term Line of Credit	$ 0	$ 0
Line of Credit [Member] \| Credit Agreement [Member] \| Bank of America [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 16,000,000,000
Debt Instrument, Interest Rate During Period	8.30%	5.20%
Line of Credit [Member] \| Senior Secured Revolving Line Of Credit [Member] \| Bank of America [Member] \| Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 15,000,000	$ 15,000
Bank of America [Member] \| Credit Agreement [Member]
Long-Term Line of Credit	$ 5,815,000	$ 6,853,000
Line of Credit Facility, Remaining Borrowing Capacity	$ 9,400,000	$ 8,400,000