Note 1 - Significant Accounting Policies 1 (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019	Dec. 31, 2017
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 8,000	$ 8,000		$ 8,000
Share-based Payment Arrangement, Noncash Expense, Total	358,000	241,000
Interest-bearing Deposits in Banks and Other Financial Institutions		0
Unrestricted Cash and Cash Equivalents	8,400,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0	0
Goodwill, Impairment Loss	0	0
Goodwill, Written off Related to Sale of Business Unit		1,100,000
Goodwill, Ending Balance	$ 780,000	780,000
Operating Loss, Carry forwards, Expiration Term	20 years
Operating Lease, Right-of-Use Asset	$ 1,481,000
Operating Lease, Liability, Total	$ 1,601,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 1,960,000
Operating Lease, Liability, Total			$ 1,960,000
Customer Concentration Risk [Member] | Accounts Receivable [Member] | US-based IT OEM Company [Member]
Concentration Risk, Percentage	96.00%	75.00%
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Noncash Expense, Total	$ 400,000	$ 200,000