Note 6 - Goodwill and Intangible Assets (Details Textual) - USD ($) |
3 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Goodwill, Purchase Accounting Adjustments | $ (131,000) | |
| Increase (Decrease) in Accounts Payable, Total | 561,000 | |
| Amortization of Intangible Assets, Total | 688,000 | $ 0 |
| CBS Acquisition [Member] | Immaterial Error [Member] | ||
| Goodwill, Purchase Accounting Adjustments | (131,000) | |
| Increase (Decrease) in Accounts Payable, Total | $ (131,000) | |