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Note 7 - Shareholders' Equity (Details Textual) - USD ($)	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jan. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement, Expense			$ 210,000	$ 105,000	$ 378,000	$ 320,000
Share-based Payment Arrangement, Plan Modification, Incremental Cost	$ 41,000
Proceeds from Issuance of Common Stock			$ 349,000		360,000
Stock Issued During Period, Shares, New Issues (in shares)			108,879
Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense			$ 181,000	$ 80,000	$ 327,000	$ 286,000
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)					4 years
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount	373,173		373,173		$ 373,173
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					1 year 3 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)					3 months 18 days
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount	$ 183,164		183,164		$ 183,164
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					90,343
Performance Stock Units [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense			$ 17,000		$ 34,000
Performance Stock Units [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		500,000