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Note 6 - Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | 2018 |  |  | 2017 |
Stock Options |  | $ | 817 |  |  | $ | 642 |
Restricted Stock Grants |  |  | 73 |  |  |  | 11 |
Total |  | $ | 890 |  |  | $ | 653 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |
Risk-free interest rate |  |  | 2.6 | % |  |  | 1.7 | %
Volatility factor |  |  | 46.8 | % |  |  | 50.0 | %
Weighted average expected life (years) |  |  | 5.0 |  |  |  | 5.0 |
Forfeiture rate |  |  | 10.0 | % |  |  | 10.0 | %
Dividends |  |  | 0.0 | % |  |  | 0.0 | %
Share-based Compensation, Stock Options, Activity [Table Text Block] |
Year Ended December 31, 2018 |
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Term |  |  | Aggregate Intrinsic Value |
Shares under Option – January 1 |  |  | 1,860,211 |  |  | $ | 5.96 |  |  |  |  |  |  |  |  |
Options Granted |  |  | 217,500 |  |  |  | 9.68 |  |  |  |  |  |  |  |  |
Options Exercised |  |  | (422,793 | ) |  |  | 4.49 |  |  |  |  |  |  |  |  |
Options Forfeited or Expired |  |  | (78,831 | ) |  |  | 11.75 |  |  |  |  |  |  |  |  |
Shares under option – December 31 |  |  | 1,576,087 |  |  | $ | 6.58 |  |  |  | 3.50 |  |  | $ | 1,946 |
Vested and Expected to Vest - December 31 |  |  | 1,475,570 |  |  | $ | 6.56 |  |  |  | 3.37 |  |  | $ | 1,851 |
Options Exercisable – December 31 |  |  | 1,064,127 |  |  | $ | 5.89 |  |  |  | 2.69 |  |  | $ | 1,565 |
Year Ended December 31, 2017 |
|  | Number of Shares |  |  | Weighted Average Exercise Price Per Share |
Shares under Option – January 1 |  |  | 2,323,581 |  |  | $ | 6.22 |
Options Granted |  |  | 244,750 |  |  |  | 5.60 |
Options Exercised |  |  | (333,305 | ) |  |  | 4.29 |
Options Forfeited or Expired |  |  | (374,815 | ) |  |  | 8.11 |
Shares under option – December 31 |  |  | 1,860,211 |  |  | $ | 5.06 |
Options Exercisable – December 31 |  |  | 1,649,594 |  |  | $ | 4.63 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] |
|  |  |  | Option Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  | Number of Outstanding Options – December 31, 2018 |  |  | Weighted- Average Remaining Contractual Life |  |  | Weighted- Average Exercise Price |  |  | Number of Options Exercisable at December 31, 2018 |  |  | Weighted- Average Exercise Price |
$3.22 | - | $3.99 |  |  | 346,148 |  |  |  | 2.56 |  |  |  | 3.79 |  |  |  | 346,148 |  |  | $ | 3.79 |
$4.00 | - | $5.99 |  |  | 451,023 |  |  |  | 4.72 |  |  |  | 4.94 |  |  |  | 217,979 |  |  |  | 4.72 |
$6.00 | - | $9.99 |  |  | 528,916 |  |  |  | 3.79 |  |  |  | 7.72 |  |  |  | 300,000 |  |  |  | 6.42 |
$10.00 | - | $15.00 |  |  | 250,000 |  |  |  | 2.00 |  |  |  | 11.00 |  |  |  | 200,000 |  |  |  | 10.00 |
$3.22 | - | $15.00 |  |  | 1,576,087 |  |  |  | 3.50 |  |  |  | 6.58 |  |  |  | 1,064,127 |  |  | $ | 5.89 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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