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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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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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

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The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Note 12 - Equity-based Compensation (Details Textual) - USD ($) $ in Thousands				1 Months Ended							3 Months Ended					6 Months Ended		12 Months Ended
	Jan. 01, 2018	May 26, 2016	Mar. 30, 2015	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010	Dec. 31, 2017	Sep. 30, 2017	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 31, 2017	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period																		68,000	0	0
Proceeds from Stock Options Exercised																		$ 185	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value																		$ 116
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																		1,616,000	1,227,000	85,000
Allocated Share-based Compensation Expense																		$ 2,542	$ 1,751	$ 1,382
Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period																		10,000	64,000	16,000
Employees and Directors [Member]
Allocated Share-based Compensation Expense																		$ 2,371	$ 1,489	$ 1,193
Mr. Cashion and Mr. Wicks [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period														4 years	90 days
Allocated Share-based Compensation Expense														$ 185
Nonemployees [Member]
Allocated Share-based Compensation Expense																		$ 243	$ 262	$ 188
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued																		86,000	89,000	27,000
Stock Issued During Period, Shares, Issued for Services																		39,000	41,000	500
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																		4 years
Employee Stock Option [Member] \| Mr. Radaelli and Mr. McPherson [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period													90 days				4 years
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost																	$ 58
Employee Stock Option [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																90 days
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost											$ 260	$ 244
Employee Stock Option [Member] \| Chief Financial Officer [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	3 years
Employee Stock Options and RSUs [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized											$ 2,000					$ 2,000		$ 2,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition																		2 years 288 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																		1,529,000	1,139,000	59,000
The 2007 Omnibus Incentive Plan [Member]
Common Stock, Capital Shares Reserved for Future Issuance																								40,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Annual Increase in Shares Authorized																							40,000
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Shares Authorized, Percentage of Outstanding Common Stock																						4.00%	4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized		1,124,826	82,461			32,646	59,157	40,000	37,427	37,207
Increase (Decrease) in Number of Shares Available for Grant				610,774	139,449
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		2,318,486
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percentage of Stock Owned by Shareholder, Minimum																		10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																		4 years
The 2007 Omnibus Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																		100.00%
The 2007 Omnibus Incentive Plan [Member] \| Minimum [Member] \| Shareholder of More Than 10% [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																		110.00%
The 2007 Omnibus Incentive Plan [Member] \| Maximum [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																		10 years
The 2017 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Annual Increase in Shares Authorized, Percentage of Outstanding Common Stock																					4.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																					2,318,486
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant											1,383,328					1,383,328		1,383,328
The 2017 Omnibus Incentive Plan [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percentage of Stock Owned by Shareholder, Minimum																		10.00%
The 2017 Omnibus Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																		100.00%
The 2017 Omnibus Incentive Plan [Member] \| Minimum [Member] \| Shareholder of More Than 10% [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent																		110.00%
The 2017 Omnibus Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																		10 years
The 2017 Omnibus Incentive Plan [Member] \| Maximum [Member] \| Shareholder of More Than 10% [Member] \| Incentive Stock Options (ISOs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																		5 years