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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Note 11 - Stock Options and Restricted Stock (Details Textual) - USD ($)				3 Months Ended				6 Months Ended
	Jan. 04, 2021	Jan. 01, 2016	Jul. 27, 2010	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jul. 18, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)				2,934				2,934		11,569
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)								0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 0				$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)								0	0
Share-Based Payment Arrangement, Nonemployee [Member]
Stock Issued During Period, Value, Issued for Services	$ 311,000
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent										$ 221,000
Stock Issued During Period, Shares, Issued for Services (in shares)					118,184
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)				182,497				182,497		24,393
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)								165,000
Restricted Stock [Member] \| Share-Based Payment Arrangement, Nonemployee [Member]
Share-based Payment Arrangement, Expense								$ 45,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)								48,129
Restricted Stock [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Payment Arrangement, Expense					$ 25,000		$ 322,000	$ 49,000	$ 358,000
Share-Based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense				$ 0		$ 1,000		0	$ 3,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 0				$ 0
Option Plan 2010 Member
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum			15.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)		381,272		0				0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)		2,541,809
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		5 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)											159,448
Option Plan 2010 Member \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		1 year
Option Plan 2010 Member \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
The 2016 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)											692,782
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)				2,934				2,934
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)											533,334
The 2016 Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)				182,497				182,497