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Note 11 - Non-vested Option Awards Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Granted (in shares) | 43,000 |  |
Granted (in dollars per share) | $ 5.28 | $ 5.96 | $ 6.25
Forfeited (in shares) | (31,450) |  |
Service Based Options [Member] |  |  |
Balance at beginning of period, nonvested (in shares) | 337,550 |  |
Weighted average grant date fair value, beginning of period, nonvested (in dollars per share) | $ 5.77 |  |
Nonvested Contractual Life (Year) | 5 years | 5 years 146 days |
Granted (in shares) | 43,000 |  |
Granted (in dollars per share) | $ 5.28 |  |
Granted (Year) | 6 years 219 days |  |
Vested (in shares) | (94,650) |  |
Vested (in dollars per share) | $ 5.64 |  |
Vested (Year) | 4 years |  |
Forfeited (in shares) | (19,250) |  |
Forfeited (in dollars per share) | $ 5.38 |  |
Forfeited (Year) | 3 years 328 days |  |
Balance at end of period, nonvested (in shares) | 266,650 | 337,550 |
Weighted average grant date fair value, end of period, nonvested (in dollars per share) | $ 5.76 | $ 5.77 |

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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 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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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