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Note 2 - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Number of Wholly Owned Subsidiaries	2
Unrecognized Tax Benefits	$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	0	$ 0
Asset Impairment Charges	0	0
Capitalized Computer Software, Net	2,000	21,000
Capitalized Computer Software, Amortization	18,000	16,000
Amortization of Intangible Assets	31,000	24,000
Research and Development Expense	433,844	605,264
Allowance for Doubtful Accounts Receivable, Current	2,000	19,000
Cash and Cash Equivalents, at Carrying Value	21,677,186	13,073,331	$ 11,966,863
Shipping, Handling and Transportation Costs	28,000	57,000
Including External Customer Orders [Member]
Research and Development Expense	$ 2,448,000	$ 1,727,000
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	5 years
Minimum [Member] | Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Useful Life	3 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Maximum [Member] | Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Asset, Useful Life	5 years

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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