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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 |  |

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