Note 12 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interlink Electronics, Inc. [Member]
Due to Related Parties, Total	$ 25,000	$ 3,000
Interlink Electronics, Inc. [Member] | Administrative Services Provided to Related Party [Member]
Related Party Transaction, Amounts of Transaction	39,000	17,000
Due from Related Parties, Total	5,000	2,000
Related Party Transaction, Payment Per Month	40,000
Interlink Electronics, Inc. [Member] | Reimbursement of Expenses Paid by Company [Member]
Related Party Transaction, Amounts of Transaction	264,000	213,000
BKF Capital Group, Inc. [Member]
Related Party Transaction, Amounts of Transaction	2,000	1,000
Due to Related Parties, Total	$ 0	$ 0