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Note 2 - Supplemental Balance-sheet Information (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Contract with Customer, Asset, after Allowance for Credit Loss, Total     $ 915,000
Amortization of Intangible Assets $ 91,000 $ 91,000  
Depreciation, Depletion and Amortization, Nonproduction, Total 200,000 $ 400,000  
Customer-Related Intangible Assets [Member]      
Finite-Lived Intangible Asset, Expected Amortization, Year One $ 36,000