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Note 11 - Debt (Details Textual)
Mar. 31, 2019
USD ($)
Long-term Debt, Current Maturities, Total $ 286,728
Long-term Debt, Excluding Current Maturities, Total 33,744
Collateral Pledged [Member] | Loan with Ministry of Science and Innovation, Due February 2, 2024 [Member] | Genasys Acquisition [Member] | Loans With Governmental Agencies [Member]  
Long-term Debt, Current Maturities, Total $ 269,856