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Note 7 - Interim condensed balance sheet disclosures (Details Textual) € / shares in Units, $ / shares in Units, € in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 03, 2022 $ / shares € / shares shares | May 31, 2022 EUR (€) | Mar. 31, 2022 EUR (€) | Jun. 30, 2022 EUR (€) € / shares shares | Jun. 30, 2022 USD ($) | Jun. 30, 2021 EUR (€) | Dec. 31, 2021 EUR (€) € / shares shares | May 11, 2022 shares
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
PayPal reserve |  |  |  | € 396 |  |  | € 6,000 |
Other current financial assets |  |  |  | 963 |  |  | 6,233 |
Other current non-financial assets |  |  |  | 15,367 |  |  | 3,236 |
Subscribed capital |  |  |  | € 9,390 |  |  | € 8,735 |
Total number of shares issued (in shares) | shares |  |  |  |  |  |  |  | 10,930,000
Percentage of overallotment option |  |  |  | 15.00% | 15.00% |  |  |
Deduction to capital reserves |  |  |  | € 842 |  | € 17 |  |
Advances, percent cancellable |  |  |  | 26.20% |  |  | 28.00% |
Advances, percent cancellable, year one |  |  |  | 54.40% |  |  | 58.00% |
Advances, percent cancellable, year two |  |  |  | 13.60% |  |  | 13.00% |
Advances, percent cancellable, year three |  |  |  | 5.80% |  |  | 1.00% |
Other non-financial liabilities |  |  |  | € 469 |  |  |  |
Financial liabilities |  |  |  | 6,146 |  |  | € 6,353 |
Additions other than through business combinations, property, plant and equipment |  |  |  | 23,959 |  | 798 |  |
Proceeds from issuing shares |  |  |  | 39,346 | $ 41,534 | € 1,500 |  |
Provisions |  |  |  | 468 |  |  | 2,202 |
Independent auditor expenses |  |  |  | € 37 |  |  | € 2,137 |
Termination employee benefits expense |  | € 14,200 |  |  |  |  |  |
Ordinary shares [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Par value per share (in EUR per share) | € / shares | € 0.06 |  |  |  |  |  |  |
Increase in number of shares outstanding, new issuances (in shares) | shares | 10,000,000 |  |  |  |  |  |  |
Shares issued, price per share (in EUR per share) | $ / shares | € 4.00 |  |  |  |  |  |  |
Subscribed capital [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Total number of shares issued (in shares) | shares |  |  |  | 84,507,641 |  |  |  |
Subscribed capital |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Total number of shares issued (in shares) | shares |  |  |  |  |  |  | 73,577,641 |
Subscribed capital | Ordinary shares [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Par value per share (in EUR per share) | € / shares |  |  |  | € 0.06 |  |  | € 0.06 |
Subscribed capital | High-voting shares [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Par value per share (in EUR per share) | € / shares |  |  |  | € 1.50 |  |  | € 1.50 |
PayPal reserve [member] | Paypal reserve released [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Reserve Released |  |  | € 5,900 |  |  |  |  |
Receivable for VAT and other taxes [member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Other current non-financial assets |  |  |  | € 2,225 |  |  | € 2,069 |
Prepaid expenses for construction of Sion prototype |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Other current non-financial assets |  |  |  | 12,871 |  |  | € 669 |
Prepayments To Contract Manufacturer [Member] |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |
Other current non-financial assets |  |  |  | € 5,323 |  |  |  |

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- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard -URIDate 2021-03-24 + Details
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