Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Contract with Customer, Liability | $ 688,900 | $ 688,900 | $ 635,100 | ||
| Contract with Customer, Liability, Revenue Recognized | $ 117,000 | $ 122,000 | $ 310,000 | $ 321,000 | |
| Minimum [Member] | |||||
| Capitalized Contract Cost, Amortization Period (Year) | 12 years | 12 years | |||
| Maximum [Member] | |||||
| Capitalized Contract Cost, Amortization Period (Year) | 60 years | 60 years | |||