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Note 1 - Description of Business and Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Cash Equivalents, at Carrying Value $ 17,362     $ 31,452
Percentage of Concentration Risk Credit Risk Financial Instruments Under Option One 5.00%      
Concentration Risk Credit Risk Financial Instruments Under Option Two $ 1,000      
Percentage of Credit Exposure Limits Based on Cash and Cash Equivalents and Marketable Securities 40.00%      
Credit Exposure Limits of Cash and Cash Equivalents and Marketable Securities Under Option Two $ 15,000      
Goodwill, Impairment Loss   $ 0 $ 0