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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2016
Advertising Expense |  | $ 1,500,000 | $ 1,000,000 | $ 1,100,000 |
Period for Creating Allowance for Doubtful Accounts |  | 120 days |  |  |
Provision for Doubtful Accounts |  | $ 1,900,000 | 600,000 | 1,300,000 |
Property, Plant and Equipment, Additions |  | 102,700,000 |  |  |
Asset Retirement Obligation |  | 793,000 | 701,000 |  |
Asset Retirement Obligation, Accretion Expense |  | $ 15,000 | $ 34,000 | $ 6,000 |
Scenario, Forecast [Member] | Accounting Standards Update 2016-02 [Member] |  |  |  |  |
New Accounting Pronouncement Effect, Right of Use Assets | $ 13,200,000 |  |  |  |
New Accounting Pronouncement Effect, Lease Obligation Liability | $ 13,200,000 |  |  |  |
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Automotive [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 22.00% |  |  |
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Medical [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 10.00% |  |  |
Sales Revenue, Services, Net [Member] | Customer Concentration Risk [Member] | Restaurant [Member] |  |  |  |  |
Concentration Risk, Percentage |  | 7.00% |  |  |
Tarzian [Member] | Common Stock [Member] |  |  |  |  |
Cost Method Investments, Ownership Percentage |  |  |  |  | 32.40%
Tarzian [Member] | Dividends Liquidation Dissolution [Member] |  |  |  |  |
Cost Method Investments, Ownership Percentage |  |  |  |  | 67.90%

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