The amount of variable consideration that may be payable.

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.

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Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability.

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Note 2 - Revenue Recognition (Details Textual) - USD ($)	Jun. 30, 2018	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Deferred Revenue	$ 11,807,000	$ 11,015,000		$ 11,656,000	$ 10,013,000	$ 9,555,000	$ 9,431,000
Accounting Standards Update 2014-09 [Member]
Deferred Revenue			$ 237,000
Extended Product Warranty Accrual, Ending Balance			151,000
Variable Consideration			210,000
Capitalized Contract Cost, Net, Total			4,700,000
Deferred Tax Liabilities, Net, Noncurrent			1,200,000
Accounting Standards Update 2014-09 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 3,800,000