Note 10 - Convertible Note - Schedule of Convertible Note (Details) - Secured Convertible Promissory Note [member] - Iliad Research and Trading, L.P. [Member] - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 26, 2019
Debt Instrument, Face Amount	$ 998	$ 2,200
Unamortized discount	(34)
Unamortized debt issuance costs	(10)
Long-term	954
Less: short-term	954
Long-term

Face (par) amount of debt instrument at time of issuance.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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