Note 10 - Income Tax - Deferred Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Reserves	$ 351,000	$ 362,000
Inventory capitalization	550,000	396,000
Compensation programs	802,000	578,000
Equity-based compensation	524,000	403,000
Lease liability	567,000	795,000
Intangible assets	0	73,000
State tax credits, net of federal impact	123,000	274,000
Gross deferred tax assets	2,917,000	2,881,000
Valuation allowance	(64,000)	(136,000)
Net deferred tax assets	2,853,000	2,745,000
Excess of book over tax basis of fixed assets	(4,527,000)	(4,877,000)
Goodwill	(2,795,000)	(2,008,000)
Right of use asset	(554,000)	(781,000)
Intangible assets	(34,000)	0
Total deferred tax liabilities	(7,910,000)	(7,666,000)
Net long-term deferred tax liabilities	$ (5,057,000)	$ (4,921,000)