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Note 9 - Stock-based Compensation (Details) - Options by Exercise Price Range (USD $) In Thousands, except Per Share data, unless otherwise specified | 6 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended
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Jun. 30, 2014 Exercise Price Range 1 [Member] Mercantile Plans [Member] | Jun. 30, 2014 Exercise Price Range 1 [Member] Firstbank Plans [Member] | Jun. 30, 2014 Exercise Price Range 2 [Member] Mercantile Plans [Member] | Jun. 30, 2014 Exercise Price Range 2 [Member] Firstbank Plans [Member] | Jun. 30, 2014 Exercise Price Range 3 [Member] Mercantile Plans [Member] | Jun. 30, 2014 Exercise Price Range 3 [Member] Firstbank Plans [Member] | Jun. 30, 2014 Exercise Price Range 4 [Member] Firstbank Plans [Member] | Jun. 30, 2014 Exercise Price Range 5 [Member] Firstbank Plans [Member] | Jun. 30, 2014 Mercantile Plans [Member] | Dec. 31, 2013 Mercantile Plans [Member] | Dec. 31, 2012 Mercantile Plans [Member] | Jun. 30, 2014 Firstbank Plans [Member] | Jun. 30, 2014 Firstbank Plans [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Range of exercise prices, lower limit | $ 6.21 | $ 4.00 | $ 32.01 | $ 8.01 | $ 40.01 | $ 12.01 | $ 20.01 | $ 24.01 | $ 6.21 | $ 6.21 | $ 6.21 | $ 7.80 |
Range of exercise prices, upper limit | $ 8.00 | $ 8.00 | $ 36.00 | $ 12.00 | $ 44.00 | $ 16.00 | $ 24.00 | $ 28.00 | $ 40.28 | $ 40.28 | $ 40.28 | $ 24.46 |
Options, outstanding (in Shares) | 2,700 | 78,855 | 51,300 | 31,830 | 2,890 | 46,000 | 85,962 | 36,456 | 56,890 |  |  | 279,103 | 279,103
Options, weighted average remaining contractual life | 1 year 146 days | 5 years 146 days | 328 days | 5 years 146 days | 109 days | 3 years 146 days | 1 year 328 days | 146 days | 328 days | 1 year 146 days | 1 year 328 days |  | 3 years 109 days
Options, outstanding weighted average exercise price | $ 6.21 | $ 6.54 | $ 34.87 | $ 8.60 | $ 40.28 | $ 16.00 | $ 22.43 | $ 24.46 | $ 33.79 |  |  | $ 15.57 | $ 15.57
Options, exercisable (in Shares) | 2,700 | 62,215 | 51,300 | 24,740 | 2,890 | 46,000 | 85,962 | 36,456 | 56,890 |  |  | 255,373 | 255,373
Options, exercisable weighted average exercise price | $ 6.21 | $ 6.90 | $ 34.87 | $ 8.60 | $ 40.28 | $ 16.00 | $ 22.43 | $ 24.46 | $ 33.79 |  |  | $ 16.44 | $ 16.44

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- Definition Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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