Note 9 - Agreements and Commitments - Changes in Warranty Obligations (Details) - USD ($) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Balance | $ 524,828 | $ 621,031 |
| Warranty costs charged to cost of goods sold | (90,350) | (87,466) |
| Utilization charges against reserve | 0 | (78,958) |
| Foreign currency effect | (14,443) | 70,221 |
| Balance | $ 420,035 | $ 524,828 |
| X | ||||||||||
- Definition Amount of increase (decrease) in the standard and extended product warranty accrual from warranties issued. No definition available.
|
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of decrease in the standard and extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard and extended product warranty. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of foreign currency translation gain (loss) which decreases (increases) the standard and extended product warranty accrual. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|