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Note 11 - Stockholders' Equity (Details Textual) - USD ($) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 09, 2016 | Nov. 30, 2006 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 12, 2007
Common Stock, Par or Stated Value Per Share |  |  | $ 0.01 | $ 0.01 |  |
Allocated Share-based Compensation Expense |  |  | $ 933,000 | $ 776,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 387,930 | 284,730 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 34,000 | 100,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  | $ 256,000 | $ 203,000 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Allocated Share-based Compensation Expense |  |  | 933,000 | 776,000 |  |
Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | 90,000 | 276,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  | 637,000 | $ 421,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | $ 990,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  | 1 year 211 days |  |  |
Minimum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 7 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period | 10 years |  |  |  |  |
The 2001 Non-qualified Stock Option Plan [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  | 300,000 |  |  |  |
Common Stock, Par or Stated Value Per Share |  | $ 0.01 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 0 | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 22,930 | 59,730 | 124,480 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 36,800 | 64,750 |  |
The 2007 Share Incentive Plan [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  | 750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 140,000 | 125,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  | 365,000 | 225,000 | 100,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  | 0 | 0 |  |
The 2007 Share Incentive Plan [Member] | Directors and Key Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 75,324 | 42,320 |  |
The 2007 Share Incentive Plan [Member] | Three Key Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 140,000 |  |  |
The 2016 Share Incentive Plan [Member] |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 750,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period | 0 |  |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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