Note 7 - Share-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
|
Share-based Payment Arrangement, Expense | $ 370,000 | $ 402,000 | $ 719,000 | $ 827,000 |
Restricted Stock [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 3 years | |||
Share-based Payment Arrangement, Expense | $ 347,000 | $ 349,000 |