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Note 2 - Sales/Mergers/Acquisitions - Acquisition of the Bates Companies (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Feb. 12, 2019 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Cash paid |  |  | $ 9,834,000 |  |  |
Common stock consideration |  |  | 81,637,000 |  |  |
Interest rate (as a percent) |  |  |  |  | 5.375% |
Business acquisition related costs |  |  | 1,795,000 |  |  |
Intangibles |  |  | 10,064,000 |  |  |
Goodwill |  | $ 74,748,000 | 77,832,000 | $ 74,066,000 |  | $ 28,334,000
Bates Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Assets under management | $ 704,000,000 |  |  |  |  |
Voting interests acquired (as a percent) | 100.00% |  |  |  |  |
Cash paid | $ 3,000,000.0 |  | $ 1,400,000 |  |  |
Cash consideration paid from operating cash | $ 1,500,000 |  |  |  |  |
Stock issued during period (in shares) |  |  | 23,501 |  |  |
Stock consideration |  |  | $ 3,000,000.0 |  |  |
Number of shares expecting to issue based on 10-day volume weighted average of the closing stock price of the Company ending five days prior to closing |  |  | 47,003 |  |  |
Business acquisition related costs |  |  | $ 394,000 |  |  |
Goodwill |  |  |  | 3,700,000 |  |
Other Liabilities. | Bates Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, contingent consideration |  |  | $ 2,000,000.0 |  |  |
Customer Lists [Member] | Bates Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Intangibles |  |  |  | $ 1,600,000 |  |
Promissory Note [Member] | Bates Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Repayment period (in years) | 5 years |  |  |  |  |
Frequency of installments | annual installments |  |  |  |  |
Periodic payment of principal amount | $ 300,000 |  |  |  |  |
Interest rate (as a percent) | 2.18% |  |  |  |  |
Promissory Note [Member] | Other Liabilities. | Bates Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Promissory note | $ 1,500,000 |  |  |  |  |
Maximum | Bates Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock consideration | $ 3,000,000.0 |  |  |  |  |
Common Stock [Member] | Bates Companies |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Stock issued during period (in shares) |  | 9,400 |  |  |  |

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