Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
Dec. 31, 2025 |
|
| Contract with Customer, Liability | $ 623,600 | $ 623,600 | $ 635,100 | ||
| Contract with Customer, Liability, Revenue Recognized | $ 71,000 | $ 82,000 | $ 381,000 | $ 404,000 | |
| Minimum [Member] | |||||
| Capitalized Contract Cost, Amortization Period (Year) | 12 years | 12 years | |||
| Maximum [Member] | |||||
| Capitalized Contract Cost, Amortization Period (Year) | 60 years | 60 years | |||