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Note 6 - Stock-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
|  | Three-month period ended |  |  | Six-month period ended |
|  | June 30, |  |  | June 30, |  |  | June 30, |  |  | June 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Stock options |  | $ | 278 |  |  | $ | 142 |  |  | $ | 470 |  |  | $ | 316 |
Restricted stock grants |  |  | 26 |  |  |  | 33 |  |  |  | 64 |  |  |  | 44 |
Total |  | $ | 304 |  |  | $ | 175 |  |  | $ | 534 |  |  | $ | 360 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  | Aggregate Intrinsic Value |
Outstanding at January 1, 2020 |  |  | 1,541,792 |  |  | $ | 6.88 |  |  |  |  |  |  |  |  |
Granted |  |  | 251,000 |  |  |  | 6.51 |  |  |  |  |  |  |  |  |
Exercised |  |  | (16,631 | ) |  |  | 4.58 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (13,084 | ) |  |  | 7.77 |  |  |  |  |  |  |  |  |
Outstanding at June 30, 2020 |  |  | 1,763,077 |  |  | $ | 6.84 |  |  |  | 3.28 |  |  | $ | 1,734 |
Vested and expected to vest at June 30, 2020 |  |  | 1,651,988 |  |  | $ | 6.78 |  |  |  | 3.08 |  |  | $ | 1,711 |
Exercisable at June 30, 2020 |  |  | 1,194,342 |  |  | $ | 6.45 |  |  |  | 1.87 |  |  | $ | 1,610 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
Risk-Free Interest Rate |  |  | 0.4 | %
Volatility Factor |  |  | 49 | %
Weighted Average Expected Life (Years) |  |  | 5.3 |
Dividends |  |  | 0.0 | %

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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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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