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Note 3 - Acquisitions (Details Textual) - USD ($) | Nov. 12, 2019 | Aug. 08, 2019 | Apr. 01, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Nov. 11, 2019 | Aug. 07, 2019 | Mar. 31, 2019
--- | --- | --- | --- | --- | --- | --- | --- | ---
Goodwill, Ending Balance |  |  |  | $ 33,506,000 | $ 33,637,000 |  |  |
Equity Method Investments |  |  |  | $ 27,000 |  |  |  |
SAVSU [Member] |  |  |  |  |  |  |  |
Equity Method Investments |  | $ 5,800,000 |  |  |  |  |  |
Astero [Member] |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 12,521,000 |  |  |  |  |
Payments to Acquire Businesses, Initial Cash Payment |  |  | 8,000,000 |  |  |  |  |
Payments to Acquire Businesses, Deferred Cash Payment |  |  | 4,500,000 |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  | 1,491,000 |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  |  | 8,500,000 |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Total |  |  | 1,500,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets |  |  | 324,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  | 4,100,000 |  |  |  |  |
Goodwill, Ending Balance |  |  | 9,515,000 |  |  |  |  | $ 9,500,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 1,100,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  | 13,941,000 |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 12,150,000 |  |  |  |  | $ 4,120,000
Business Combination, Consideration Transferred, Total |  |  | 13,941,000 |  |  |  |  |
Astero [Member] | Earnout Payments Payable in Each Calendar Years of 2019, 2020 and 2021 [Member] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  | 3,500,000 |  |  |  |  |
Astero [Member] | Earnout Payment for Calendar Year 2021 [Member] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  | $ 5,000,000 |  |  |  |  |
SAVSU [Member] |  |  |  |  |  |  |  |
Goodwill, Ending Balance |  | $ 19,500,000 |  |  |  |  | $ 21,037,000 |
Business Combinations, Number of Shares Acquired (in shares) |  | 8,616 |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 55.60% |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) |  | 1,100,000 |  |  |  |  |  |
Share Price (in dollars per share) |  | $ 18.12 |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  | $ 19,932,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  | 35,800,000 |  |  |  |  | $ 35,850,000 |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value |  | $ 15,900,000 |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  | 44.00% |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net, Total |  | $ 10,100,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets, Net |  | 4,200,000 |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 12,200,000 |  |  |  |  |  |
Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination, Total |  | $ 35,800,000 |  |  |  |  |  |
CBS Acquisition [Member] |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 11,000,000 |  |  |  |  |  |  |
Payments to Acquire Businesses, Initial Cash Payment | 11,000,000 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred | 856,000 |  |  |  |  |  |  |
Goodwill, Ending Balance | 3,100,000 |  |  |  |  | $ 2,954,000 |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | 4,000,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total |  |  |  |  |  | 15,856,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets, Net | 6,000,000 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 6,800,000 |  |  |  |  | $ 6,790,000 |  |
Business Combination, Consideration Transferred, Total | 15,856,000 |  |  |  |  |  |  |
Business Combination, Cash Holdback Escrow to Satisfy Indemnification Claims | 550,000 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Escrow Holdback | 3,000,000 |  |  |  |  |  |  |
CBS Acquisition [Member] | Earning Payments Payable in Each Calendar Year 2020, 2021, 2022, 2023, and 2024 [Member] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | $ 15,000,000 |  |  |  |  |  |  |

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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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