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Note 9 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jan. 12, 2016 | Jul. 28, 2015
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  |  |
Dividends, Common Stock, Total |  |  |  |  | $ 4.6 |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  | $ 70.0 | $ 15.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 21.9 |  |  |  | $ 21.9 |  |
Dividends, Per Share, Cash Paid (in dollars per share) | $ 0.20 |  |  |  |  |  |

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
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