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Note 7 - Common Stock, Treasury Stock and Warrants | 6 Months Ended
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Jun. 30, 2021
Notes to Financial Statements |
Stockholders' Equity Note Disclosure [Text Block] | 7. Common stock, treasury stock and warrants Common stock As of June 30, 2021 and December 31, 2020, the number of issued shares of common stock was 82,440,259 and 80,295,141, respectively, which included shares of treasury stock of 4,068,832 and 3,945,867, respectively. For the six months ended June 30, 2021, the change in the number of issued shares of common stock was the result of an aggregate 1,947,118 shares of common stock issued upon vesting of RSUs, including 122,965 shares of common stock withheld to cover statutory taxes upon such vesting, which are reflected in treasury stock, as discussed below. The change also included the exercise of 198,000 stock options by a former key executive. Treasury stock As of June 30, 2021 and December 31, 2020, the Company held shares of treasury stock of 4,068,832 and 3,945,867, with a cost of $10,666 and $9,999, respectively. The Company's share-based incentive plans allow employees the option to either make cash payment or forfeit shares of common stock upon vesting to satisfy federal and state statutory tax withholding obligations associated with equity awards. The forfeited shares of common stock may be taken into treasury stock by the Company or sold on the open market. For the six months ended June 30, 2021, 122,965 shares of common stock were withheld to cover statutory taxes owed by certain employees for this purpose, all of which were taken into treasury stock. See Note 8, Share-based compensation. Warrants As of June 30, 2021 and December 31, 2020, warrants to purchase an aggregate of 833,333 of common stock were outstanding with exercise prices ranging from $3.75 to $6.00 per share. On July 9, 2018 the Company entered into First Amendments (the "First Amendments") to the Amendments to Warrants and Agreements to Exercise ("Amended Whitehorse Warrants") with (i) H.I.G. Whitehorse SMA ABF, L.P. regarding 46,667 warrants to purchase common stock of the Company, par value $0.0005 per share, at an exercise price of $3.00 per share; (ii) H.I.G. Whitehorse SMA Holdings I, LLC regarding 66,666 warrants to purchase common stock of the Company at an exercise price of $3.00 per share; and (iii) Whitehorse Finance, Inc. regarding 186,667 warrants to purchase common stock of the Company at an exercise price of $3.00 per share. In November 2017, the Amended Whitehorse Warrants were exercised and the Company issued an aggregate of 300,000 shares of common stock of the Company (the "Warrant Shares") to the warrant holders. Pursuant to the First Amendments, the warrant holders had the right, but not the obligation, to require the Company to purchase from these warrant holders the 300,000 Warrant Shares at $3.8334 per share (the "Put Right"), which could be exercised during the period commencing January 1, 2019 and ending December 15, 2019. On December 6, 2019, the Company entered into the Second Amendments to the Amended Whitehorse Warrants, pursuant to which the expiration of the Put Right was extended from December 15, 2019 to January 31, 2020. On January 31, 2020, the holders of the Amended Whitehorse Warrants exercised the Put Right, requiring the Company to purchase from the warrant holders the 300,000 Warrant Shares for an aggregate of $1,150. The Company funded such purchase with cash on hand.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -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 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496171-112644 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496189-112644 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 16 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496180-112644 Reference 14: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=123467817&loc=SL123496158-112644 Reference 15: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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