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Note 2 - Significant Accounting Policies (Details Textual)
3 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2022
Contract with Customer, Liability, Revenue Recognized $ 91,000 $ 49,000  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Number 1 [Member]      
Concentration Risk, Percentage 24.00% 26.00%  
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Customer Number 2 [Member]      
Concentration Risk, Percentage 17.00% 14.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]      
Number of Major Customers 2   2
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Three Customers [Member]      
Concentration Risk, Percentage 63.00%   63.00%