Note 9 - Stockholders' Equity - Common Stock Outstanding (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Common stock outstanding (in shares)	1,006,768	1,070,586
Repurchase and cancellation of shares of Common Stock (in shares)		(64,084)
Shares issued in connection with exercise of stock options (in shares)	7,806	266
Shares issued in connection with Reverse Split (in shares)	525
Shares issued in connection with Employment Agreement (in shares)	5,036
Common stock outstanding (in shares)	1,020,135	1,006,768