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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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The number of customers represented in a concentration.

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Represents the number of financial instruments in which the Company's cash and cash equivalents are primarily deposited.

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The period of the warranty to which the Company's products are generally subject.

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Note 2 - Summary of Significant Accounting Policies (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Operating Lease, Right-of-Use Asset	$ 565,000			$ 629,000
Operating Lease, Liability, Total	$ 575,000			$ 629,000
Number of Financial Institutions	1
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 395,000		$ 284,000
Contract with Customer, Asset, after Allowance for Credit Loss, Total	0		0
Contract with Customer, Liability, Total	$ 679,000		$ 686,000
Equity Method Investment, Other than Temporary Impairment		$ 0
Minimum [Member]
Warranty Period	1 year
Maximum [Member]
Warranty Period	3 years
Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Number of Customers	3	2
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Customers [Member]
Concentration Risk, Percentage	42.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk, Percentage		54.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Number of Customers	4		3
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Three Customers [Member]
Concentration Risk, Percentage			54.00%
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Four Customers [Member]
Concentration Risk, Percentage	62.00%