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Note 9 - Share-based Payments (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | Year ended December 31,
|  | 2018 |  |  | 2017 |
Risk-free interest rate, average |  |  | — |  |  |  | 2.21 |
Expected option life, average (in years) |  |  | — |  |  |  | 7.9 |
Expected price volatility, average |  |  | — |  |  |  | 40.71 |
Expected dividend yield |  |  | — |  |  |  | 2.83 |
Share-based Compensation, Stock Options, Activity [Table Text Block] |
|  | Number of Shares |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (Years) |  |  | Aggregate Intrinsic Value |
As of December 31, 2016 |  |  | 850,232 |  |  | $ | 8.06 |  |  |  | 5.78 |  |  | $ | 3,001 |
Granted |  |  | 105,000 |  |  |  | 9.90 |  |  |  |  |  |  |  |  |
Expired and canceled |  |  | (3,144 | ) |  |  | 10.29 |  |  |  |  |  |  |  |  |
Forfeited prior to vesting |  |  | (8,996 | ) |  |  | 11.01 |  |  |  |  |  |  |  |  |
Exercised |  |  | (178,662 | ) |  |  | 5.90 |  |  |  |  |  |  |  |  |
As of December 31, 2017 |  |  | 764,430 |  |  | $ | 8.78 |  |  |  | 6.48 |  |  | $ | 1,038 |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Expired and canceled |  |  | (106,108 | ) |  |  | 7.56 |  |  |  |  |  |  |  |  |
Forfeited prior to vesting |  |  | (34,066 | ) |  |  | 10.79 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
As of December 31, 2018 |  |  | 624,256 |  |  | $ | 8.87 |  |  |  | 5.28 |  |  | $ | — |
Vested and Expected to Vest at December 31, 2017 |  |  | 764,430 |  |  | $ | 8.78 |  |  |  | 6.48 |  |  | $ | 1,038 |
Vested at December 31, 2017 |  |  | 529,669 |  |  | $ | 7.89 |  |  |  | 5.50 |  |  | $ | 1,033 |
Vested and Expected to Vest at December 31, 2018 |  |  | 624,256 |  |  | $ | 8.87 |  |  |  | 5.28 |  |  | $ | — |
Vested at December 31, 2018 |  |  | 548,045 |  |  | $ | 8.62 |  |  |  | 4.90 |  |  | $ | — |
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] |
|  | 2018 |  |  | 2017 |
Shares purchased under ESPP plan |  |  | 23,789 |  |  |  | 9,110 |
Plan compensation expense |  | $ | 10 |  |  | $ | 13 |

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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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