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Note 6 - Goodwill and Intangibles - Changes in customer list intangible (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Balance at the beginning of period | $ 14,970 | $ 17,450 |
Intangibles amortization | 2,149 | 2,266 | $ 1,692
Balance at the end of the period | 11,381 | 14,970 | 17,450
Customer Lists [Member] |  |  |
Balance at the beginning of period | 1,504 | 1,855 |
Intangibles amortization | (64) | (137) |
Balance at the end of the period |  | 1,504 | $ 1,855
Bates Companies | Customer Lists [Member] |  |  |
Acquisition of Bates Companies - measurement period adjustment |  | $ (214) |
Bates Companies | Customer Lists [Member] |  |  |
Sale of Bates Companies | $ (1,440) |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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