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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
$ / shares in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Cash, Uninsured Amount $ 1,051,000     $ 1,051,000  
Contract with Customer, Liability, Revenue Recognized       115,000  
Advertising Expense 7,003   $ 13,064 14,788 $ 19,700
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total $ 0   $ 0 $ 0 $ 0
Earnings Per Share, Basic and Diluted, Total (in dollars per share) $ (0)   $ 0 $ 0 $ 0
Maximum [Member]          
Product Warranty Expense       $ 2,000 $ 2,000
Property, Plant and Equipment, Useful Life (Year)   7 years      
Minimum [Member]          
Property, Plant and Equipment, Useful Life (Year)       5 years  
Electronic Products [Member]          
Warranty Term (Day)       90 days  
Electronic Controllers for Spas and Hot Tubs [Member]          
Warranty Term (Day)       5 years