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The percentage of stock option exercisable.

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Refers to Share based compensation by share based payment fully vested stock awards grant date fair value.

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The forfeiture rate of share based compensation.

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Aggregate number of common shares reserved for future issuance.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Net number of non-option equity instruments granted to participants.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Number of share instruments newly issued under a share-based compensation plan.

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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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Purchase price of common stock expressed as a percentage of its fair value.

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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Note 6 - Stockholders' Equity, Stock Plans and Stock-based Compensation Expense (Details Textual) - USD ($)		12 Months Ended
	Dec. 15, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2013	Oct. 31, 2017	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 8,300,000	$ 8,000,000	$ 3,600,000
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options, Net		$ 1,300,000	$ 4,000,000	$ 9,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		21,010	278,250	162,000
Shares Paid for Tax Withholding for Share Based Compensation		77,049	64,490	56,157
Adjustments Related to Tax Withholding for Share-based Compensation		$ 3,130,360	$ 11,471,000	$ 619,000
Minimum [Member]
Share Based Compensation, Forfeiture Rate			0.00%
Maximum [Member]
Share Based Compensation, Forfeiture Rate			17.00%
Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			7,745
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Option Granted Contractual Term					7 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		$ 12,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 229 days
Employee Stock Option [Member] \| Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Employee Stock Option [Member] \| Non-employees [Member] \| Vesting on First Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Employee Stock Option [Member] \| Non-employees [Member] \| Vesting Each Month After First Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		0.02083%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		265,124	412,208	480,191
Share Price		$ 17.02	$ 45.35	$ 17.35			$ 12.79
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 4,900,000	$ 2,500,000	$ 2,200,000
Restricted Stock Units (RSUs) [Member] \| Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		3,384	2,478	0
Restricted Stock Units (RSUs) [Member] \| Non-employees [Member] \| Vesting Each Anniversary of Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted		49,498	117,418	204,976
Stock Purchase Plan [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total		$ 272,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		120 days
1998 Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		4,650,000
Two Thousand Four Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		1,750,000
Number of Stock Awards Counted for Every Share Granted or Canceled		2.12
Share Based Compensation by Share Based Payment Fully Vested Stock Awards Grant Date Fair Value					$ 60,000
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total		13,392	21,605	45,350
Two Thousand Four Equity Incentive Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Option Exercisable in Hundredths		25.00%
Share Price		$ 17.02	$ 45.35	$ 17.35			$ 12.79
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Share Based Compensation by Share Based Payment Fully Vested Stock Awards Grant Date Fair Value						$ 60,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				6,500
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period		120,273	270,707	229,865
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	100,000
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	15.00%
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	15.00%
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Two Thousand Four Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| President and Chief Executive Officer [Member] \| Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	45.00%
2004 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		600,000
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		85.00%
Stock Issued During Period, Shares, Employee Stock Ownership Plan		64,511	78,479	79,922
Common Stock, Capital Shares Reserved for Future Issuance		627,073