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Note 6 - Nil Coupon Non-redeemable Convertible Unsecured Loan Notes (Details Textual) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($)
Share Price (in dollars per share) | $ / shares | $ 1.40 |
Unsecured Debt [Member] | NIL Coupon Non-redeemable Convertible Unsecured Loan Notes [Member] |  |
Debt Instrument, Face Amount | $ | $ 76 |
Debt Instrument, Convertible, Number of Equity Instruments | 6,715 |
Debt Instrument, Convertible, Carrying Amount of Equity Component | $ | $ 9 |
Debt Instrument, Interest Rate, Stated Percentage | 0.00% |
Debt Instrument, Repurchase Amount | $ | $ 0 | $ 0
Unsecured Debt [Member] | NIL Coupon Non-redeemable Convertible Unsecured Loan Notes [Member] | Minimum [Member] |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | $ 6.50 |
Unsecured Debt [Member] | NIL Coupon Non-redeemable Convertible Unsecured Loan Notes [Member] | Maximum [Member] |  |
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares | $ 11.43 |

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