Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 3,296	$ 3,456
Trade accounts receivable, net	11,467	7,902
Inventories, net	22,543	23,952
Prepaid expenses and other current assets	1,991	1,892
Total current assets	39,297	37,202
Property, plant and equipment, net	5,174	5,366
Operating lease right-of-use (ROU) assets	1,448	1,560
Investments	0	742
Deferred tax assets, net	4,116	4,116
Capitalized product development cost	147	0
Other assets	397	422
Total assets	50,579	49,408
Current liabilities:
Accounts payable	9,067	9,822
Accrued compensation and related taxes	1,577	1,302
Accrued warranty expense	774	722
Accrued other expenses and other current liabilities	371	363
Short-term operating lease liabilities	536	525
Credit facility	7,338	6,476
Notes payable-current portion	48	71
Deferred revenue	1,239	1,137
Total current liabilities	20,950	20,418
Long-term operating lease liabilities	1,122	1,260
Deferred revenue	6,990	6,419
Total liabilities	29,062	28,097
Stockholders' equity:
Preferred stock; $1.00 par value; 1,000,000 authorized shares; none issued or outstanding	0	0
Common stock; $0.60 par value; 10,000,000 authorized shares; 3,871,792 and 3,867,082 issued and 3,529,712 and 3,577,002 outstanding shares as of March, 31, 2024 and December 31, 2023, respectively	2,323	2,320
Additional paid-in capital	48,775	48,602
Accumulated deficit	(23,528)	(24,209)
Treasury stock, at cost, 342,080 and 290,080 shares as of March 31, 2024, and December 31, 2023, respectively	(6,053)	(5,402)
Total stockholders' equity	21,517	21,311
Total liabilities and stockholders' equity	$ 50,579	$ 49,408