Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 14,763,745	$ 22,071,523
Accounts receivable	430,849	331,196
Inventories	393,698	430,493
Prepaid expense and other assets	381,233	526,801
Total current assets	15,969,525	23,360,013
Property and equipment, net	1,548,805	1,833,255
Intangibles, net	266,183	253,865
Lease right-of-use assets	3,008,397	211,893
Other long-term assets	174,096	75,618
Total assets	20,967,006	25,734,644
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable	1,013,481	943,452
Accrued expenses and other liabilities	1,650,300	2,229,075
Derivative liability	5,572	13,833
Contract liabilities	627,896	602,073
Lease liability	466,087	94,237
Total current liabilities	3,763,336	3,882,670
Lease liability – net of current portion	2,498,613	86,082
Total liabilities	6,261,949	3,968,752
Commitments and contingencies
Stockholders’ equity:
Common stock, $.01 par value, 200,000,000 shares authorized, 4,006,301 and 3,938,160 shares outstanding as of June 30, 2023 and December 31, 2022, respectively	40,063	39,382
Additional paid-in capital	175,787,288	175,503,634
Accumulated deficit	(161,123,086)	(153,777,916)
Total stockholders’ equity	14,705,057	21,765,892
Total liabilities and stockholders’ equity	20,967,006	25,734,644
Series B Convertible Preferred Stock [Member]
Stockholders’ equity:
Preferred stock, 20,000,000 shares authorized inclusive of designated below	$ 792	$ 792