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Note 11 - Stockholders' Equity - Stock Option Plan (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Beginning balance, number outstanding (in shares) | 387,930 |
Exercise of stock options (in shares) | 0 | 34,000
Ending balance, number outstanding (in shares) | 407,930 | 387,930
Number of shares exercisable (in shares) | 257,930 | 207,930
The 2001 Non-qualified Stock Option Plan [Member] |  |
Beginning balance, number outstanding (in shares) | 22,930 | 59,730
Granted during period (in shares) |  |
Exercise of stock options (in shares) |  | 36,800
Canceled during period (in shares) |  |
Ending balance, number outstanding (in shares) | 22,930 | 22,930
Number of shares exercisable (in shares) | 22,930 | 22,930
Beginning balance, weighted average exercise price (in dollars per share) | $ 5.36 | $ 4.51
Granted during period, weighted average exercise price (in dollars per share) |  |
Exercised during period, weighted average exercise price (in dollars per share) |  | 3.97
Canceled during period, weighted average exercise price (in dollars per share) |  |
Ending balance, weighted average exercise price (in dollars per share) | 5.36 | 5.36
Number exercisable, weighted average exercise price (in dollars per share) | $ 5.36 | $ 5.36
The 2007 Share Incentive Plan [Member] |  |
Beginning balance, number outstanding (in shares) | 365,000 | 225,000
Granted during period (in shares) |  | 140,000
Exercise of stock options (in shares) |  |
Canceled during period (in shares) |  |
Ending balance, number outstanding (in shares) | 365,000 | 365,000
Number of shares exercisable (in shares) | 235,000 | 185,000
Beginning balance, weighted average exercise price (in dollars per share) | $ 12.35 | $ 9.43
Granted during period, weighted average exercise price (in dollars per share) |  | 10.82
Exercised during period, weighted average exercise price (in dollars per share) |  |
Canceled during period, weighted average exercise price (in dollars per share) |  |
Ending balance, weighted average exercise price (in dollars per share) | 12.35 | 12.35
Number exercisable, weighted average exercise price (in dollars per share) | $ 13.15 | $ 13.76
The 2016 Share Incentive Plan [Member] |  |
Beginning balance, number outstanding (in shares) |  |
Granted during period (in shares) | 20,000 |
Exercise of stock options (in shares) |  |
Canceled during period (in shares) |  |
Ending balance, number outstanding (in shares) | 20,000 |
Number of shares exercisable (in shares) |  |
Beginning balance, weighted average exercise price (in dollars per share) |  |
Granted during period, weighted average exercise price (in dollars per share) | 8.07 |
Exercised during period, weighted average exercise price (in dollars per share) |  |
Canceled during period, weighted average exercise price (in dollars per share) |  |
Ending balance, weighted average exercise price (in dollars per share) | 8.07 |
Number exercisable, weighted average exercise price (in dollars per share) |  |

X
- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under 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)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, 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 or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -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 (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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