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Note 6 - Fair Value Measurements (Details Textual) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2024
Mar. 31, 2023
Sep. 30, 2023
Oct. 04, 2023
Marketable Securities, Total $ 0 $ 0   $ 0  
Goodwill and Intangible Asset Impairment       $ 0  
Payment for Contingent Consideration Liability, Financing Activities   219 $ (0)    
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   44 $ 0    
Evertel Technologies, LLC [Member]          
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High         $ 1,050
Business Combination, Contingent Consideration, Liability $ 60 60     $ 890
Business Combination, Contingent Consideration, Liability Settled   874      
Payment for Contingent Consideration Liability, Financing Activities   219      
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability   $ 44      
Evertel Technologies, LLC [Member] | Contingent Consideration Liability [Member]          
Stock Issued During Period, Shares, Acquisitions 236,343 236,343