Note 14 - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent, Total	8.10%	24.20%	21.80%
Deferred Tax Assets, Valuation Allowance, Total	$ 1,937,000
Unrecognized Tax Benefits, Ending Balance	0	$ 1,220,000	$ 1,132,000
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Including Limitation Amount	21,800,000
Operating Loss Carryforwards, Limitation Amount	15,500,000
Operating Loss Carryforwards, Total	21,800,000
Operating Loss Carryforwards, Subject to Expiration	20,200,000
Operating Loss Carryforwards, Not Subject to Expiration	$ 1,600,000
Open Tax Year	2017 2018 2019 2020
State and Local Jurisdiction [Member] | Department of Revenue Services for the State of Connecticut [Member]
Operating Loss Carryforwards, Total	$ 55,800,000
Operating Loss Carryforwards, Maximum Percentage of Taxable Income Per Year Allowed to be Offset by NOLs	50.00%
Open Tax Year	2017 2018 2019 2020
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member]
Open Tax Year	2017 2018 2019 2020