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Note 11 - Dispositions (Details Textual) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 14, 2020 | Feb. 01, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Payments to Acquire Investments, Total |  |  | $ 94.8 | $ (0.0) | $ (0.0)
Background Screening Business [Member] |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested, Total | $ 23.1 |  |  |  |
Background Screening Business [Member] | Other Operating Income (Expense) [Member] |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | 15.9 |  |
Data Warehouse Business [Member] | Other Operating Income (Expense) [Member] |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  | $ 3.5 |  |
Vexcel Group, Inc. [Member] |  |  |  |  |
Payments to Acquire Investments, Total |  | $ 63.8 |  |  |
Equity Securities Without Readily Determinable Fair Value, Percentage |  | 35.00% |  |  |

X
- Definition Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4582445-111684 + Details
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- Definition The cash outflow associated with the purchase of all investments (debt, security, other) during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition This element represents the cash inflow during the period from the sale of a component of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
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