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Note 2 - Supplemental Balance-sheet Information (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Amortization of Intangible Assets, Total $ 91,000 $ 91,000
Depreciation, Depletion and Amortization, Nonproduction, Total 0.4 $ 0.4
Customer-Related Intangible Assets [Member]    
Finite-Lived Intangible Asset, Expected Amortization, Year One 91,000  
Finite-Lived Intangible Asset, Expected Amortization, Year Two $ 34,000