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Note 2 - Revenue Recognition (Details Textual) - USD ($)
Mar. 31, 2020
Mar. 31, 2019
Contract with Customer, Asset, after Allowance for Credit Loss, Total $ 0  
Contract with Customer, Liability, Total 7,217,000 $ 4,426,000
GPT Acquisition [Member]    
Contract with Customer, Liability, Total $ 2,716