Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Assets, Current [Abstract]
Cash	$ 5,197,235	$ 8,728,660
Accounts receivable	509,445	333,697
Inventories	441,718	494,374
Prepaid expense and other assets	412,925	521,700
Total current assets	6,561,323	10,078,431
Property and equipment, net	1,087,718	1,233,910
Intangibles, net	245,594	252,457
Lease right-of-use assets	2,582,456	2,728,355
Other long-term assets	124,096	124,096
Total assets	10,601,187	14,417,249
Current liabilities:
Accounts payable	1,729,126	1,342,027
Note payable	38,036	150,408
Accrued expenses and other liabilities	1,904,612	1,631,702
Derivative liability	367	1,376
Contract liabilities	304,320	308,091
Lease liability	540,200	517,427
Total current liabilities	4,516,661	3,951,031
Other long-term liabilities	3,507	5,459
Lease liability – net of current portion	2,027,348	2,188,979
Total liabilities	6,547,516	6,145,469
Commitments and Contingencies
Stockholders’ equity:
Common stock, $.01 par value, 200,000,000 shares authorized, 4,062,853 shares outstanding as of March 31, 2024, and December 31, 2023	40,629	40,629
Additional paid-in capital	175,992,976	175,992,242
Accumulated deficit	(171,980,726)	(167,761,883)
Total stockholders’ equity	4,053,671	8,271,780
Total liabilities and stockholders’ equity	10,601,187	14,417,249
Series B Convertible Preferred Stock [Member]
Stockholders’ equity:
Series B Convertible Preferred Stock, $.01 par value, 2,300,000 shares authorized, 79,246 shares outstanding as of March 31, 2024, and December 31, 2023	$ 792	$ 792