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Note 14 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Granted (in shares) | 154,500 |  |
Granted (in dollars per share) | $ 6.19 | $ 4.34 | $ 3.17
Forfeited (in shares) | (28,302) |  |
Service Based Options [Member] |  |  |
Balance at beginning of period, nonvested (in shares) | 413,228 |  |
Weighted average grant date fair value, beginning of period, nonvested (in dollars per share) | $ 3.79 |  |
Nonvested Contractual Life (Year) | 5 years 73 days | 5 years 36 days |
Granted (in shares) | 154,500 |  |
Granted (in dollars per share) | $ 6.19 |  |
Granted (Year) | 6 years 255 days |  |
Vested (in shares) | (146,546) |  |
Vested (in dollars per share) | $ 3.73 |  |
Vested (Year) | 3 years 146 days |  |
Forfeited (in shares) | (27,702) |  |
Forfeited (in dollars per share) | $ 4.26 |  |
Forfeited (Year) | 5 years 36 days |  |
Balance at end of period, nonvested (in shares) | 393,480 | 413,228 |
Weighted average grant date fair value, end of period, nonvested (in dollars per share) | $ 4.72 | $ 3.79 |

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- Definition Sharebased compensation arrangement by sharebased payment award options forfeited weighted average remaining contractual term2. + References No definition available. + Details
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- Definition Sharebased compensation arrangement by sharebased payment award options granted weighted average remaining contractual term1. + References No definition available. + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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