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Note A - Overview and Significant Accounting Policies (Details Textual) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 30, 2018 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Number of Reportable Segments |  | 3 |
Impairment of Long-Lived Assets Held-for-use |  | $ 0.8 | $ 4.7
Deductible For Individual Health Care Claims |  | 0.3 |
Self Insurance Reserve |  | $ 1.4 | $ 2.1
Securities Purchase Agreement [Member] | Series A Preferred Stock [Member] | Wipro [Member] |  |  |
Sale of Stock, Number of Shares Issued in Transaction (in shares) | shares | 9,926 |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | shares | 1,001,614 |  |
Convertible Preferred Stock, Shares Issued upon Conversion as Percent of Common Stock Outstanding |  | 15.00% |
Sale of Stock, Consideration Received on Transaction | $ 9.9 |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Number of Major Customers |  | 1 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Maximum [Member] |  |  |
Concentration Risk, Percentage |  |  | 10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |
Concentration Risk, Percentage |  | 10.00% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Number of Major Customers |  | 25 | 25
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Maximum [Member] |  |  |
Concentration Risk, Percentage |  |  | 10.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |
Concentration Risk, Percentage |  | 11.20% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Twenty Five Customers [Member] |  |  |
Concentration Risk, Percentage |  | 62.00% | 64.00%

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